--- a/tests/test-revset2.t Thu Apr 04 19:08:37 2019 +0200
+++ b/tests/test-revset2.t Fri Apr 05 04:09:41 2019 +0530
@@ -1627,6 +1627,7 @@
> printprevset = $TESTTMP/printprevset.py
> EOF
+ $ unset P
$ hg --config revsetalias.P=1 printprevset
P=[1]
$ P=3 hg --config revsetalias.P=2 printprevset