cargo v0.27 tests failed when build rust 1.26.2 on "stable" channel #5648
Description
If rust configured with
[rust]
channel = "stable"
then test test_resolving_minimum_version_with_transitive_deps from cargo/tests/testsuite/resolve.rs will fail with next error:
---- resolve::test_resolving_minimum_version_with_transitive_deps stdout ----
thread 'resolve::test_resolving_minimum_version_with_transitive_deps' panicked at 'called `Result::unwrap()` on an `Err` value: ErrorMessage { msg: "the `-Z` flag is only accepted on the nightly channel of Cargo" }', libcore/result.rs:945:5