* noob question on cl-flet.
@ 2016-04-20 14:50 Shiyao Ma
2016-04-20 15:50 ` Drew Adams
0 siblings, 1 reply; 3+ messages in thread
From: Shiyao Ma @ 2016-04-20 14:50 UTC (permalink / raw)
To: help-gnu-emacs
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.
^ permalink raw reply [flat|nested] 3+ messages in thread* RE: noob question on cl-flet.
2016-04-20 14:50 noob question on cl-flet Shiyao Ma
@ 2016-04-20 15:50 ` Drew Adams
2016-04-20 16:08 ` Michael Heerdegen
0 siblings, 1 reply; 3+ messages in thread
From: Drew Adams @ 2016-04-20 15:50 UTC (permalink / raw)
To: Shiyao Ma, help-gnu-emacs
> (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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: noob question on cl-flet.
2016-04-20 15:50 ` Drew Adams
@ 2016-04-20 16:08 ` Michael Heerdegen
0 siblings, 0 replies; 3+ messages in thread
From: Michael Heerdegen @ 2016-04-20 16:08 UTC (permalink / raw)
To: help-gnu-emacs
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-04-20 15:50 ` Drew Adams
2016-04-20 16:08 ` Michael Heerdegen
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