read-file-name: resulting file name must satisfy predicate ?

[Lennart Borgman]

The doc string for `read-file-name' says

   If optional sixth arg predicate is non-nil, possible completions and
   the resulting file name must satisfy (funcall predicate NAME).

However testing with

   (read-file-name "File: " nil nil nil nil (lambda(name) (string-match 
"wantname")))

and entering some characters for the file name and then pressing <RET> 
just seem to return whatever the mini-buffer shows. Maybe this is 
correct. The doc string could be read as "resulting file name from 
completion". But it is in my opinion still unclear and a bit unexpected.

This is on w32. GNU Emacs 22.0.50.1 (i386-mingw-nt5.0.2195) of 2006-03-28.