Use nightly...

Author: ryoqun

ci/test-checks.sh

@@ -41,10 +41,10 @@ _ cargo "+${rust_nightly}" install cargo-hack --locked
 
 # Check implicit usage of `dev-utils`-gated code in non-dev (= production) code by
 # buidling without dev dependencies (= tests/benches) for each crate
-_ cargo hack check --bins
+_ cargo "+${rust_nightly}" hack check --bins
 # Check implicit usage of `dev-utils`-gated code in dev (= test/benches) code by
 # building in isolation from other crates, which might happen to enable `dev-utils`
-_ cargo hack check --all-targets
+_ cargo "+${rust_nightly}" hack check --all-targets
 
 echo --- build environment
 (