Thansk for reporting this. I will add something to etc/NEWS.
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It looks like read-file-name is behaving as documented for both emacs
21 and emacs 22. What I missed before is that the two documented
behavior is different for the two. So the problem seems to be that
the change in behavior of read-file-name was not documented in NEWS
file.
Emacs 22 doc-string
Evaluating following expression then hitting ENTER when prompted
results in incorrect value of "" rather than the expected value of
".el". For example, emacs version 21.4 returns "*.el", but
emacs 22 that I compiled using the latest code from cvs as of today
2006/12/26 results in "".
(let ((ins
