Subject: describe-function on broken aliases no longer works

From: Glenn Morris <[email-masked]>
Date: Fri, 20 Oct 2017 15:55:05 -0400

Package: emacs
Version: 26.0.90

In emacs -Q:

(defalias 'foo 'foo2)
C-h f foo RET

With Emacs 25.3:
  -> foo is an alias for 'foo2', which is not defined.  Please make a bug report.

With Emacs 26.0.90:
  -> Invalid function: nil

By experiment, this is due to 2d99269.