Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'

[Glenn Morris]

Richard Stallman wrote:

> If the byte compiler warns about that case, it is being too
> ambitious. Thus, if the value of an expression is stored into a
> variable, the compiler should consider the value "used".
>
> So if this warning really happens, it is a bug. Can it be
> reproduced?

There's nothing to worry about AFAICS:

(let ((foo (mapcar (lambda (e) e) '(a b c)))))     ; warning

(let ((foo (mapcar (lambda (e) e) '(a b c))))      ; no warning
  foo)                            

(defvar foo nil)
(defun foo-func ()
  foo)
(let ((foo (mapcar (lambda (e) e) '(a b c))))      ; no warning
  (foo-func))