-*- mode: compilation; default-directory: "/ssh:detlef:/home/albinus/tmp/" -*-
Compilation started at Wed Jan  6 14:06:15

g++ -DHAVE_CONFIG_H -I. -std=c++11 -Wall -Werror -Wclobbered -Wempty-body -Wignored-qualifiers -Wmissing-field-initializers -Wsign-compare -Wtype-limits -Wuninitialized -Winit-self -Wcast-align -Wfloat-equal -Wformat=2 -Wno-psabi -I/usr/include/libxml2 -I../../../kilo -I../../../rapidxml -g3 -Og -DDEBUG=1 -MT test.lo -MD -MP -MF -c test.cpp  -fPIC -DPIC -o .libs/test.o
test.cpp:23:7: error: ‘Nested::Nested’ has the same name as the class in which it is declared
   23 | class Nested
      |       ^~~~~~
test.cpp: In constructor ‘A2::A2()’:
test.cpp:95:27: error: no match for ‘operator=’ (operand types are ‘std::shared_ptr<A1>’ and ‘A1*’)
   95 |     A2() {A1 a1; a1ptr = &a1;}
      |                           ^~
In file included from /usr/include/c++/10/memory:84,
                 from test.cpp:6:
/usr/include/c++/10/bits/shared_ptr.h:358:19: note: candidate: ‘std::shared_ptr<_Tp>& std::shared_ptr<_Tp>::operator=(const std::shared_ptr<_Tp>&) [with _Tp = A1]’
  358 |       shared_ptr& operator=(const shared_ptr&) noexcept = default;
      |                   ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:358:29: note:   no known conversion for argument 1 from ‘A1*’ to ‘const std::shared_ptr<A1>&’
  358 |       shared_ptr& operator=(const shared_ptr&) noexcept = default;
      |                             ^~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:362:2: note: candidate: ‘template<class _Yp> std::shared_ptr<_Tp>::_Assignable<const std::shared_ptr<_Yp>&> std::shared_ptr<_Tp>::operator=(const std::shared_ptr<_Yp>&) [with _Yp = _Yp; _Tp = A1]’
  362 |  operator=(const shared_ptr<_Yp>& __r) noexcept
      |  ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:362:2: note:   template argument deduction/substitution failed:
test.cpp:95:27: note:   mismatched types ‘const std::shared_ptr<_Tp>’ and ‘A1*’
   95 |     A2() {A1 a1; a1ptr = &a1;}
      |                           ^~
In file included from /usr/include/c++/10/memory:84,
                 from test.cpp:6:
/usr/include/c++/10/bits/shared_ptr.h:373:2: note: candidate: ‘template<class _Yp> std::shared_ptr<_Tp>::_Assignable<std::auto_ptr<_Up> > std::shared_ptr<_Tp>::operator=(std::auto_ptr<_Up>&&) [with _Yp = _Yp; _Tp = A1]’
  373 |  operator=(auto_ptr<_Yp>&& __r)
      |  ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:373:2: note:   template argument deduction/substitution failed:
test.cpp:95:27: note:   mismatched types ‘std::auto_ptr<_Up>’ and ‘A1*’
   95 |     A2() {A1 a1; a1ptr = &a1;}
      |                           ^~
In file included from /usr/include/c++/10/memory:84,
                 from test.cpp:6:
/usr/include/c++/10/bits/shared_ptr.h:382:7: note: candidate: ‘std::shared_ptr<_Tp>& std::shared_ptr<_Tp>::operator=(std::shared_ptr<_Tp>&&) [with _Tp = A1]’
  382 |       operator=(shared_ptr&& __r) noexcept
      |       ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:382:30: note:   no known conversion for argument 1 from ‘A1*’ to ‘std::shared_ptr<A1>&&’
  382 |       operator=(shared_ptr&& __r) noexcept
      |                 ~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/shared_ptr.h:390:2: note: candidate: ‘template<class _Yp> std::shared_ptr<_Tp>::_Assignable<std::shared_ptr<_Yp> > std::shared_ptr<_Tp>::operator=(std::shared_ptr<_Yp>&&) [with _Yp = _Yp; _Tp = A1]’
  390 |  operator=(shared_ptr<_Yp>&& __r) noexcept
      |  ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:390:2: note:   template argument deduction/substitution failed:
test.cpp:95:27: note:   mismatched types ‘std::shared_ptr<_Tp>’ and ‘A1*’
   95 |     A2() {A1 a1; a1ptr = &a1;}
      |                           ^~
In file included from /usr/include/c++/10/memory:84,
                 from test.cpp:6:
/usr/include/c++/10/bits/shared_ptr.h:398:2: note: candidate: ‘template<class _Yp, class _Del> std::shared_ptr<_Tp>::_Assignable<std::unique_ptr<_Up, _Ep> > std::shared_ptr<_Tp>::operator=(std::unique_ptr<_Up, _Ep>&&) [with _Yp = _Yp; _Del = _Del; _Tp = A1]’
  398 |  operator=(unique_ptr<_Yp, _Del>&& __r)
      |  ^~~~~~~~
/usr/include/c++/10/bits/shared_ptr.h:398:2: note:   template argument deduction/substitution failed:
test.cpp:95:27: note:   mismatched types ‘std::unique_ptr<_Tp, _Dp>’ and ‘A1*’
   95 |     A2() {A1 a1; a1ptr = &a1;}
      |                           ^~
test.cpp: At global scope:
test.cpp:105:38: error: ‘a1’ was not declared in this scope; did you mean ‘v1’?
  105 | const std::vector<std::string> v1(1, a1);
      |                                      ^~
      |                                      v1
test.cpp:107:32: error: redefinition of ‘const std::vector<std::__cxx11::basic_string<char> > v1’
  107 | const std::vector<std::string> v1(1, n1);
      |                                ^~
test.cpp:105:32: note: ‘const std::vector<std::__cxx11::basic_string<char> > v1’ previously declared here
  105 | const std::vector<std::string> v1(1, a1);
      |                                ^~
test.cpp:107:38: error: ‘n1’ was not declared in this scope; did you mean ‘v1’?
  107 | const std::vector<std::string> v1(1, n1);
      |                                      ^~
      |                                      v1
test.cpp:109:36: error: invalid conversion from ‘const std::vector<std::__cxx11::basic_string<char> >*’ to ‘std::vector<std::__cxx11::basic_string<char> >*’ [-fpermissive]
  109 | std::vector<std::string> * v1_cptr(&v1);
      |                                    ^~~
      |                                    |
      |                                    const std::vector<std::__cxx11::basic_string<char> >*
test.cpp:111:1: error: expected unqualified-id before ‘return’
  111 | return(s1+s2);
      | ^~~~~~
test.cpp: In member function ‘int A1::f1()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:115:5: note: in expansion of macro ‘AN_BODY’
  115 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:115:5: note: in expansion of macro ‘AN_BODY’
  115 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:115:5: note: in expansion of macro ‘AN_BODY’
  115 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:115:5: note: in expansion of macro ‘AN_BODY’
  115 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:115:5: note: in expansion of macro ‘AN_BODY’
  115 |     AN_BODY;
      |     ^~~~~~~
test.cpp:116:1: error: no return statement in function returning non-void [-Werror=return-type]
  116 | }
      | ^
test.cpp: In member function ‘int A1::f2()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:120:5: note: in expansion of macro ‘AN_BODY’
  120 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:120:5: note: in expansion of macro ‘AN_BODY’
  120 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:120:5: note: in expansion of macro ‘AN_BODY’
  120 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:120:5: note: in expansion of macro ‘AN_BODY’
  120 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:120:5: note: in expansion of macro ‘AN_BODY’
  120 |     AN_BODY;
      |     ^~~~~~~
test.cpp:121:1: error: no return statement in function returning non-void [-Werror=return-type]
  121 | }
      | ^
test.cpp: In member function ‘int A1::f3()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:125:5: note: in expansion of macro ‘AN_BODY’
  125 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:125:5: note: in expansion of macro ‘AN_BODY’
  125 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:125:5: note: in expansion of macro ‘AN_BODY’
  125 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:125:5: note: in expansion of macro ‘AN_BODY’
  125 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:125:5: note: in expansion of macro ‘AN_BODY’
  125 |     AN_BODY;
      |     ^~~~~~~
test.cpp:126:1: error: no return statement in function returning non-void [-Werror=return-type]
  126 | }
      | ^
test.cpp: In member function ‘int A1::f4()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:130:5: note: in expansion of macro ‘AN_BODY’
  130 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:130:5: note: in expansion of macro ‘AN_BODY’
  130 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:130:5: note: in expansion of macro ‘AN_BODY’
  130 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:130:5: note: in expansion of macro ‘AN_BODY’
  130 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:130:5: note: in expansion of macro ‘AN_BODY’
  130 |     AN_BODY;
      |     ^~~~~~~
test.cpp:131:1: error: no return statement in function returning non-void [-Werror=return-type]
  131 | }
      | ^
test.cpp: In member function ‘int A1::f5()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:135:5: note: in expansion of macro ‘AN_BODY’
  135 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:135:5: note: in expansion of macro ‘AN_BODY’
  135 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:135:5: note: in expansion of macro ‘AN_BODY’
  135 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:135:5: note: in expansion of macro ‘AN_BODY’
  135 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:135:5: note: in expansion of macro ‘AN_BODY’
  135 |     AN_BODY;
      |     ^~~~~~~
test.cpp:136:1: error: no return statement in function returning non-void [-Werror=return-type]
  136 | }
      | ^
test.cpp: In member function ‘int A1::f6()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:140:5: note: in expansion of macro ‘AN_BODY’
  140 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:140:5: note: in expansion of macro ‘AN_BODY’
  140 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:140:5: note: in expansion of macro ‘AN_BODY’
  140 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:140:5: note: in expansion of macro ‘AN_BODY’
  140 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:140:5: note: in expansion of macro ‘AN_BODY’
  140 |     AN_BODY;
      |     ^~~~~~~
test.cpp:141:1: error: no return statement in function returning non-void [-Werror=return-type]
  141 | }
      | ^
test.cpp: In member function ‘int A1::f7()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:145:5: note: in expansion of macro ‘AN_BODY’
  145 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:145:5: note: in expansion of macro ‘AN_BODY’
  145 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:145:5: note: in expansion of macro ‘AN_BODY’
  145 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:145:5: note: in expansion of macro ‘AN_BODY’
  145 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:145:5: note: in expansion of macro ‘AN_BODY’
  145 |     AN_BODY;
      |     ^~~~~~~
test.cpp:146:1: error: no return statement in function returning non-void [-Werror=return-type]
  146 | }
      | ^
test.cpp: In member function ‘int A1::f8()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:150:5: note: in expansion of macro ‘AN_BODY’
  150 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:150:5: note: in expansion of macro ‘AN_BODY’
  150 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:150:5: note: in expansion of macro ‘AN_BODY’
  150 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:150:5: note: in expansion of macro ‘AN_BODY’
  150 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:150:5: note: in expansion of macro ‘AN_BODY’
  150 |     AN_BODY;
      |     ^~~~~~~
test.cpp:151:1: error: no return statement in function returning non-void [-Werror=return-type]
  151 | }
      | ^
test.cpp: In member function ‘int A1::f9()’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:155:5: note: in expansion of macro ‘AN_BODY’
  155 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:155:5: note: in expansion of macro ‘AN_BODY’
  155 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:155:5: note: in expansion of macro ‘AN_BODY’
  155 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:155:5: note: in expansion of macro ‘AN_BODY’
  155 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:155:5: note: in expansion of macro ‘AN_BODY’
  155 |     AN_BODY;
      |     ^~~~~~~
test.cpp:156:1: error: no return statement in function returning non-void [-Werror=return-type]
  156 | }
      | ^
test.cpp: At global scope:
test.cpp:158:5: error: no declaration matches ‘int A1::f10()’
  158 | int A1::f10()
      |     ^~
test.cpp:158:5: note: no functions named ‘int A1::f10()’
test.cpp:8:7: note: ‘class A1’ defined here
    8 | class A1
      |       ^~
test.cpp: In function ‘int main(int, char**)’:
test.cpp:101:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:165:5: note: in expansion of macro ‘AN_BODY’
  165 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:101:22: note:   candidate expects 3 arguments, 1 provided
  101 |     std::string s1(x1);                                            \
      |                      ^
test.cpp:165:5: note: in expansion of macro ‘AN_BODY’
  165 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:102:22: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(A1&)’
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:165:5: note: in expansion of macro ‘AN_BODY’
  165 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:625:9: note: candidate: ‘template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  625 |         basic_string(_InputIterator __beg, _InputIterator __end,
      |         ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:625:9: note:   template argument deduction/substitution failed:
test.cpp:102:22: note:   candidate expects 3 arguments, 1 provided
  102 |     std::string s2(x2);                                            \
      |                      ^
test.cpp:165:5: note: in expansion of macro ‘AN_BODY’
  165 |     AN_BODY;
      |     ^~~~~~~
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/stdexcept:39,
                 from /usr/include/c++/10/system_error:41,
                 from /usr/include/c++/10/mutex:42,
                 from test.cpp:3:
/usr/include/c++/10/bits/basic_string.h:587:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  587 |       basic_string(basic_string&& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:587:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:583:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  583 |       basic_string(const basic_string& __str, const _Alloc& __a)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:583:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:579:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:579:45: note:   no known conversion for argument 1 from ‘A1’ to ‘std::initializer_list<char>’
  579 |       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:552:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  552 |       basic_string(basic_string&& __str) noexcept
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:552:35: note:   no known conversion for argument 1 from ‘A1’ to ‘std::__cxx11::basic_string<char>&&’
  552 |       basic_string(basic_string&& __str) noexcept
      |                    ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  540 |       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:540:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:525:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:525:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const char*’
  525 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:510:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  510 |       basic_string(const _CharT* __s, size_type __n,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:510:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:492:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  492 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:492:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:476:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  476 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:476:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:461:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]’
  461 |       basic_string(const basic_string& __str, size_type __pos,
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:461:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/10/bits/basic_string.h:448:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  448 |       basic_string(const basic_string& __str)
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:448:40: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::__cxx11::basic_string<char>&’
  448 |       basic_string(const basic_string& __str)
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/10/bits/basic_string.h:440:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:440:34: note:   no known conversion for argument 1 from ‘A1’ to ‘const std::allocator<char>&’
  440 |       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
      |                    ~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/basic_string.h:431:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’
  431 |       basic_string()
      |       ^~~~~~~~~~~~
/usr/include/c++/10/bits/basic_string.h:431:7: note:   candidate expects 0 arguments, 1 provided
test.cpp:103:8: error: unused variable ‘n1’ [-Werror=unused-variable]
  103 | Nested n1;
      |        ^~
test.cpp:165:5: note: in expansion of macro ‘AN_BODY’
  165 |     AN_BODY;
      |     ^~~~~~~
cc1plus: all warnings being treated as errors

Compilation exited abnormally with code 1 at Wed Jan  6 14:06:17