bug#7056: 24.0.50; Spurious vars in C-h v completion

[Chong Yidong]

I see this in Emacs 23.1 onwards, including latest bzr trunk.

emacs -Q
C-h v beg RET

This pops up a *Help* buffer with the contents

   beg is void as a variable.

   Documentation:
   Not documented as a variable.

Similar for `end', `v', and `val'.  I think `v' and `val' come from
let-bindings in describe-variable; not sure about `beg' and `end'.

The call to completing-read in describe-variable should do something to
filter out these false completions.


GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2010-09-16 on furry