test-check-rust-format: specify --edition=2018
rustfmt doesn't read Cargo.toml unless it's executed by cargo.
https://github.com/rust-lang/rustfmt#rusts-editions
--- a/tests/test-check-rust-format.t Thu Apr 16 22:30:11 2020 +0900
+++ b/tests/test-check-rust-format.t Fri Apr 17 19:35:18 2020 +0900
@@ -5,5 +5,5 @@
$ cd "$TESTDIR"/..
$ RUSTFMT=$(rustup which --toolchain nightly rustfmt)
$ for f in `testrepohg files 'glob:**/*.rs'` ; do
- > $RUSTFMT --check --unstable-features --color=never $f
+ > $RUSTFMT --check --edition=2018 --unstable-features --color=never $f
> done