Fix rustc_tools_util's `version.host_compiler` release channel, expose the rustc version, and add tests (#14123)

changelog: Fix rustc_tools_util's `version.host_compiler` release
channel, expose the rustc version, and add tests.

Previously the host_compiler would be set to "nighly" on the stable
channel. Generally, the field felt a bit neglected neither being printed
not tested.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/versioncheck.rs b/tests/versioncheck.rs
index ed357137095..ea540d48a2b 100644
--- a/tests/versioncheck.rs
+++ b/tests/versioncheck.rs
@@ -90,3 +90,9 @@ fn check_that_clippy_has_the_same_major_version_as_rustc() {
         },
     }
 }
+
+#[test]
+fn check_host_compiler() {
+    let version = rustc_tools_util::get_version_info!();
+    assert_eq!(version.host_compiler, Some("nightly".to_string()));
+}