--- a/tests/test-contrib-perf.t	Wed Jan 10 17:24:25 2018 +0100
+++ b/tests/test-contrib-perf.t	Sun Dec 17 04:31:27 2017 +0100
@@ -175,7 +175,7 @@
   $ (testrepohg files -r 1.2 glob:mercurial/*.c glob:mercurial/*.py;
   >  testrepohg files -r tip glob:mercurial/*.c glob:mercurial/*.py) |
   > "$TESTDIR"/check-perf-code.py contrib/perf.py
-  contrib/perf.py:498:
+  contrib/perf.py:\d+: (re)
    >     from mercurial import (
    import newer module separately in try clause for early Mercurial
   [1]