showstack: use raw docstring
Avoids a SyntaxWarning on Python 3.8 due to invalid \ escape.
Differential Revision: https://phab.mercurial-scm.org/D5838
--- a/contrib/showstack.py Mon Feb 04 14:00:57 2019 -0800
+++ b/contrib/showstack.py Mon Feb 04 14:03:15 2019 -0800
@@ -1,7 +1,7 @@
# showstack.py - extension to dump a Python stack trace on signal
#
# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
-"""dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
+r"""dump stack trace when receiving SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on BSDs)
"""
from __future__ import absolute_import, print_function