--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-check-rust-format.t	Sat Dec 07 13:07:25 2019 -0800
@@ -0,0 +1,9 @@
+#require rustfmt test-repo
+
+  $ . "$TESTDIR/helpers-testrepo.sh"
+
+  $ cd "$TESTDIR"/..
+  $ RUSTFMT=$(rustup which --toolchain nightly rustfmt)
+  $ for f in `testrepohg files 'glob:**/*.rs'` ; do
+  >   $RUSTFMT --check --unstable-features --color=never $f
+  > done