Stefan is right that the bug was there for a long time. I would like my patch be compatible with older versions of emacs that don't have string-suffix-p, so here is the revised version
# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: alex@3form.com-20140511205538-1asyz50g7d3y4lgw
# target_branch: :parent
# testament_sha1: d9ca6f57d0d8486d42ed77a739877a208a34f22e
# timestamp: 2014-05-11 13:55:53 -0700
# base_revision_id: monnier@iro.umontreal.ca-20140511034953-\
# 1mzcrftziwhrw9hl
#
# Begin patch
=== modified file 'lisp/subr.el'
--- lisp/subr.el 2014-04-09 01:48:07 +0000
+++ lisp/subr.el 2014-05-11 20:55:38 +0000
@@ -1857,10 +1857,14 @@
load-path (get-load-suffixes)))
nil nil
t))
- (let ((file (locate-file library
- (or path load-path)
- (append (unless nosuffix (get-load-suffixes))
- load-file-rep-suffixes))))
+ (let ((file
+ (locate-file library
+ (or path load-path)
+ (unless (or nosuffix
+ (string-match "\\.elc?\\.gz\\'" library))
+ (if (string-match "\\.elc?\\'" library)
+ load-file-rep-suffixes
+ (get-load-suffixes))))))
(if interactive-call
(if file
(message "Library is file %s" (abbreviate-file-name file))
# Begin bundle
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