Package:  emacs
Severity: minor

	With a recently-built Emacs (287740d6; 2014-11-29 13:56:59Z),
	the following sequence results in the backtrace MIMEd
	(redacted.)  I do not observe the issue with 24.3.1, so it
	appears to be a regression.

$ emacs -Q 
C-x b *xxx* RET
(#
M-: xx TAB

	This seems to happen because elisp--local-variables tries to
	gather variable names for completion from the contents of the
	buffer M-: is invoked from, while such buffer does not
	necessarily hold any (valid) Emacs Lisp code.

	My suggestion would be to either make elisp--local-variables
	fail more gracefully (say, using with-demoted-errors), or to
	introduce a (derived-mode-p 'emacs-lisp-mode) guard to the code.

	As a workaround, the following seems to help:

(setq elisp--local-variables-completion-table nil)

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