diff options
Diffstat (limited to 'lisp/emacs-lisp')
| -rw-r--r-- | lisp/emacs-lisp/bytecomp.el | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el index 2c14bb66609..10b65d4c47e 100644 --- a/lisp/emacs-lisp/bytecomp.el +++ b/lisp/emacs-lisp/bytecomp.el @@ -2831,6 +2831,10 @@ That command is designed for interactive use only" fn)) (defun byte-compile-normal-call (form) (if byte-compile-generate-call-tree (byte-compile-annotate-call-tree form)) + (when (and for-effect (eq (car form) 'mapcar)) + (byte-compile-set-symbol-position 'mapcar) + (byte-compile-warn + "`mapcar' called for effect; use `mapc' or `dolist' instead")) (byte-compile-push-constant (car form)) (mapc 'byte-compile-form (cdr form)) ; wasteful, but faster. (byte-compile-out 'byte-call (length (cdr form)))) |