noob question on cl-flet.

noob question on cl-flet.

[Shiyao Ma]

Hi,

for this code:

(cl-flet ((myfunc nil
                  (message "i am in")))
  (myfunc)
  (princ (symbol-function 'myfunc)))


Why symbol-function gives nil? My expectation is the function.

RE: noob question on cl-flet.

[Drew Adams]

> (cl-flet ((myfunc nil
>                   (message "i am in")))
>   (myfunc)
>   (princ (symbol-function 'myfunc)))
> 
> Why symbol-function gives nil? My expectation is the function.

It returns nil because the symbol `myfunc' has an undefined function slot - it is not defined as a global function.

The binding created by `cl-flet' is not a binding of a Lisp (global) symbol.  It is a local (let-like) lexical binding.

Re: noob question on cl-flet.

[Michael Heerdegen]

Drew Adams <drew.adams@oracle.com> writes:

> The binding created by `cl-flet' is not a binding of a Lisp (global)
> symbol.  It is a local (let-like) lexical binding.

@Shiyao (sorry if this is impolite and @Ma would have been correct): A
very related question has been discussed just some days ago, see
<87pototkq5.fsf@mbork.pl> in thread

   `pp-eval-expression' behaves strangely under lexical binding

This is an equivalent issue, just that we are here speaking of named
functions defined in lexical scope vs. the function cell of a symbol.


Michael.