declare-function doc string clarification about FILE

* lisp/subr.el (declare-function): Mention that FILE can be nil
(bug#21466).

diff --git a/lisp/subr.el b/lisp/subr.el
index 49c26cc0d33a36150f7022b405e6086bffb0daa6..59a1af01ba6993a847de38bce386a8b4a1d05e02 100644 (file)
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -31,7 +31,8 @@
   "Tell the byte-compiler that function FN is defined, in FILE.
 The FILE argument is not used by the byte-compiler, but by the
 `check-declare' package, which checks that FILE contains a
-definition for FN.
+definition for FN.  (FILE can be nil, and that disables this
+check.)
 
 FILE can be either a Lisp file (in which case the \".el\"
 extension is optional), or a C file.  C files are expanded