bug#7812: 23.2; compilation-error-regexp-alist extremely unfriendly to customization interface

[Glenn Morris]

I've simply fixed the custom :type for 23.3.

Until a diff-list [1] custom type exists, If I wanted to add an
element to this list in my .emacs, and still get any updated defaults
in future new versions of Emacs, I might do something like:

(eval-after-load "compile"
  '(add-to-list 'compilation-error-regexp-alist ... ))


[1] http://lists.gnu.org/archive/html/emacs-devel/2001-12/msg00264.html