--- a/tests/run-tests.py Sun Dec 16 17:36:51 2018 -0500
+++ b/tests/run-tests.py Sun Dec 16 17:42:45 2018 -0500
@@ -2640,6 +2640,10 @@
self._tmpbindir = self._bindir
self._pythondir = os.path.join(self._installdir, b"lib", b"python")
+ # Force the use of hg.exe instead of relying on MSYS to recognize hg is
+ # a python script and feed it to python.exe. Legacy stdio is force
+ # enabled by hg.exe, and this is a more realistic way to launch hg
+ # anyway.
if os.name == 'nt' and not self._hgcommand.endswith(b'.exe'):
self._hgcommand += b'.exe'