bug#15836: 24.3; query-replace-regexp does not detect incorrect usage of \#

[Marcin Kasperski]

I made mistake while entering regexp replacement, and got very
confusing error message.

Try the following: enter non-empty buffer and

   M-x query-replace-regexp
   ^
   \,(\#)

{ I  got this after correcting from earlier used \,(+ 1 \#)  }

Effect: 

   Symbol's function definition is void: replace-count

(which made me look for uninstalled libraries, spoiled files etc)

Expected effect:

   Some error pointing on regexp syntax.

GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.6.4)
 of 2013-10-03 on louvi, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11303000
System Description:     Ubuntu 13.04

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