Subject: 24.3.50; `C-M-x' does not work, with `defcustom' inside `when'

From: Drew Adams <[email-masked]>
Date: Fri, 25 Oct 2013 08:44:44 -0700 (PDT)

emacs -Q

(when t
  (defcustom foo nil
   "..."
   :type boolean))

M-x set-variable foo t

Put point on foo in the defcustom sexp, and do `C-M-x'.  `foo' is echoed
in the echo area, giving you the impression that the defcustom was
reevaluated, reinitializing `foo'.

C-h v foo ;; => t, not nil.

Without the `when', i.e., with the `defcustom' at top level, the value
is nil, as a user would expect.

In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2013-10-19 on LEG570
Bzr revision: 114715 [email-masked]
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1'