diff -r a708b65baeb9 -r ee112eb69d2a mercurial/ignore.py
--- a/mercurial/ignore.py	Tue Nov 01 15:37:00 2011 -0500
+++ b/mercurial/ignore.py	Thu Nov 03 11:24:55 2011 -0500
@@ -78,6 +78,7 @@
             pats[f] = []
             fp = open(f)
             pats[f], warnings = ignorepats(fp)
+            fp.close()
             for warning in warnings:
                 warn("%s: %s\n" % (f, warning))
         except IOError, inst: