commit 523a243840feb4d5f444a1b128e540876afac3d2
author Serhiy Storchaka <storchaka@gmail.com> Thu Jun 15 16:55:22 2017 +0300
committer GitHub <noreply@github.com> Thu Jun 15 16:55:22 2017 +0300
tree 25f46a1865e7e2f584a7d73c03ca9d650edd3dd1
parent 86b95370c45dedb8a56c9894372a43681de47a73

[3.6] bpo-30605: Fix compiling binary regexs with BytesWarnings enabled. (GH-2016) (#2214)

Running our unit tests with `-bb` enabled triggered this failure..
(cherry picked from commit 171b9a354e816eebc6d4c3a8553303942e9c5025)

Lib/sre_parse.py

diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py
index 608f9a2..b505e11 100644
--- a/Lib/sre_parse.py
+++ b/Lib/sre_parse.py
@@ -736,7 +736,7 @@
                         if not first or subpattern:
                             import warnings
                             warnings.warn(
-                                'Flags not at the start of the expression %s%s' % (
+                                'Flags not at the start of the expression %r%s' % (
                                     source.string[:20],  # truncate long regexes
                                     ' (truncated)' if len(source.string) > 20 else '',
                                 ),