bug#73874: 29.4; Inconsistent cl-loop behavior with Common Lisp

bug#73874: 29.4; Inconsistent cl-loop behavior with Common Lisp

[Bohong Huang via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hello, Emacs developers! When I was porting a Common Lisp library to
Emacs Lisp, I found that the following minimal code example fails the
assertion in Emacs Lisp:

```lisp
(cl-loop for i in '(1 2 3)
         for j = (1- i)
         and k = (1+ i)
         do (cl-assert (= i (1+ j) (1- k))))
```

But it works fine in any proper Common Lisp implementation:

```lisp
(loop for i in '(1 2 3)
      for j = (1- i)
      and k = (1+ i)
      do (assert (= i (1+ j) (1- k))))
```

By observing the macro expansion, it seems that `cl-loop` does not
correctly handle the `for ... and ...` clauses, which should bind
multiple variables in the current loop context in parallel, but
`cl-loop` always uses the values from the first iteration.

Thank you in advance for your time on this issue.


In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.43,
cairo version 1.18.0)
System Description: Manjaro Linux

Configured using:
 'configure --with-pgtk --with-native-compilation=aot --sysconfdir=/etc
 --prefix=/usr --libexecdir=/usr/lib --with-tree-sitter
 --localstatedir=/var --with-cairo --disable-build-details
 --with-harfbuzz --with-libsystemd --with-modules 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3
 -Wformat -Werror=format-security -fstack-clash-protection
 -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto'
 'LDFLAGS=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro
 -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto'
 'CXXFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer
 -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: zh_CN.UTF-8
  value of $LC_NUMERIC: zh_CN.UTF-8
  value of $LC_TIME: zh_CN.UTF-8
  value of $LANG: zh_CN.UTF-8
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  savehist-mode: t
  nerd-icons-completion-mode: t
  marginalia-mode: t
  repeat-mode: t
  which-key-mode: t
  sis-global-context-mode: t
  sis-context-mode: t
  sis-global-respect-mode: t
  sis-global-cursor-color-mode: t
  sis-auto-refresh-mode: t
  isearch-mb-mode: t
  global-treesit-auto-mode: t
  pixel-scroll-precision-mode: t
  popper-echo-mode: t
  popper-mode: t
  cnfonts-mode: t
  vertico-mouse-mode: t
  vertico-mode: t
  mode-line-bell-mode: t
  doom-modeline-mode: t
  winner-mode: t
  minibuffer-depth-indicate-mode: t
  override-global-mode: t
  url-handler-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-lua hides /usr/share/emacs/29.4/lisp/org/ob-lua
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-lob hides /usr/share/emacs/29.4/lisp/org/ob-lob
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-lisp hides /usr/share/emacs/29.4/lisp/org/ob-lisp
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-lilypond hides /usr/share/emacs/29.4/lisp/org/ob-lilypond
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-latex hides /usr/share/emacs/29.4/lisp/org/ob-latex
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-julia hides /usr/share/emacs/29.4/lisp/org/ob-julia
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-js hides /usr/share/emacs/29.4/lisp/org/ob-js
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-java hides /usr/share/emacs/29.4/lisp/org/ob-java
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-haskell hides /usr/share/emacs/29.4/lisp/org/ob-haskell
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-groovy hides /usr/share/emacs/29.4/lisp/org/ob-groovy
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-gnuplot hides /usr/share/emacs/29.4/lisp/org/ob-gnuplot
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-fortran hides /usr/share/emacs/29.4/lisp/org/ob-fortran
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-forth hides /usr/share/emacs/29.4/lisp/org/ob-forth
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-exp hides /usr/share/emacs/29.4/lisp/org/ob-exp
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-eval hides /usr/share/emacs/29.4/lisp/org/ob-eval
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-eshell hides /usr/share/emacs/29.4/lisp/org/ob-eshell
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-emacs-lisp hides /usr/share/emacs/29.4/lisp/org/ob-emacs-lisp
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-dot hides /usr/share/emacs/29.4/lisp/org/ob-dot
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-ditaa hides /usr/share/emacs/29.4/lisp/org/ob-ditaa
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-css hides /usr/share/emacs/29.4/lisp/org/ob-css
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-core hides /usr/share/emacs/29.4/lisp/org/ob-core
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-comint hides /usr/share/emacs/29.4/lisp/org/ob-comint
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-clojure hides /usr/share/emacs/29.4/lisp/org/ob-clojure
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-calc hides /usr/share/emacs/29.4/lisp/org/ob-calc
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-awk hides /usr/share/emacs/29.4/lisp/org/ob-awk
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-R hides /usr/share/emacs/29.4/lisp/org/ob-R
/home/coco24/.emacs.d/elpa/org-9.8pre0.20240922.161519/ob-C hides /usr/share/emacs/29.4/lisp/org/ob-C
/home/coco24/.emacs.d/elpa/eldoc-1.15.0.0.20240708.123037/eldoc hides /usr/share/emacs/29.4/lisp/emacs-lisp/eldoc

Features:
(shadow sort mail-extr emacsbug message yank-media puny dired-ext dired
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threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo gtk pgtk lcms2 multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 561522 182453)
 (symbols 48 28656 4)
 (strings 32 188792 10817)
 (string-bytes 1 5002799)
 (vectors 16 46534)
 (vector-slots 8 1546336 151419)
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 (intervals 56 1666 0)
 (buffers 984 13))

bug#73874: 29.4; Inconsistent cl-loop behavior with Common Lisp

[Stefan Kangas]

Bohong Huang <bohonghuang@qq.com> writes:

> Hello, Emacs developers! When I was porting a Common Lisp library to
> Emacs Lisp, I found that the following minimal code example fails the
> assertion in Emacs Lisp:
>
> ```lisp
> (cl-loop for i in '(1 2 3)
>          for j = (1- i)
>          and k = (1+ i)
>          do (cl-assert (= i (1+ j) (1- k))))
> ```
>
> But it works fine in any proper Common Lisp implementation:
>
> ```lisp
> (loop for i in '(1 2 3)
>       for j = (1- i)
>       and k = (1+ i)
>       do (assert (= i (1+ j) (1- k))))
> ```
>
> By observing the macro expansion, it seems that `cl-loop` does not
> correctly handle the `for ... and ...` clauses, which should bind
> multiple variables in the current loop context in parallel, but
> `cl-loop` always uses the values from the first iteration.
>
> Thank you in advance for your time on this issue.

Is this a duplicate of Bug#72753?

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=72753