tests/test-issue4074.t

--- a/tests/test-issue4074.t	Thu Jun 15 14:22:39 2017 -0400
+++ b/tests/test-issue4074.t	Tue Jun 20 09:45:02 2017 -0400
@@ -16,12 +16,12 @@
 
 Check in a big file:
 
-  $ python ../s.py > a
+  $ $PYTHON ../s.py > a
   $ hg ci -qAm0
 
 Modify it:
 
-  $ python ../s.py > a
+  $ $PYTHON ../s.py > a
 
 Time a check-in, should never take more than 10 seconds user time: