--- a/tests/test-check-rust-format.t	Mon Jul 29 10:06:28 2024 +0200
+++ b/tests/test-check-rust-format.t	Mon Jul 29 10:04:00 2024 +0200
@@ -5,7 +5,7 @@
   $ cd "$TESTDIR"/..
 
 Warning: Keep this in sync with hghave.py
-  $ RUSTFMT=$(rustup which --toolchain nightly-2021-11-02 rustfmt)
+  $ RUSTFMT=$(rustup which --toolchain nightly-2024-07-16 rustfmt)
   $ for f in `testrepohg files 'glob:**/*.rs'` ; do
   >   $RUSTFMT --check --edition=2018 --unstable-features --color=never $f
   > done