diff --git a/scripts/run-all-cleanup b/scripts/run-all-cleanup
--- a/scripts/run-all-cleanup
+++ b/scripts/run-all-cleanup
@@ -8,3 +8,6 @@ set -x
 scripts/docs-headings.py
 scripts/generate-ini.py
 scripts/whitespacecleanup.sh
+
+hg loc 'set:!binary()&grep("^#!.*python")' '*.py' | xargs scripts/pyflakes
+echo "no blocking problems found by $0"