Add run-pass-recent-rustc tests

Author: kevinmehall

tests/run-pass/rule_impl_use_bound.rs renamed to tests/run-pass-recent-rustc/rule_impl_use_bound.rs

@@ -1,3 +1,4 @@
+// Disabled because the `use<>`` syntax requires at least Rust 1.82.0 and fails the MSRV test in CI
 use core::fmt::Debug;
 
 // `--features trace` code names the return type, so doesn't work with `impl Trait`

tests/trybuild.rs

@@ -4,6 +4,14 @@ fn main() {
 
     t.pass("tests/run-pass/*.rs");
 
+    if version_check::is_min_version("1.82.0").unwrap_or(false) {
+        // Tests that involve syntax that is not supported on the MSRV. This
+        // version can be increased to any stable version as needed.
+        t.pass("tests/run-pass-recent-rustc/*.rs");
+    } else {
+        eprintln!("!!! Skipped run-pass-recent-rustc !!!");
+    }
+
     let expected_rust_ver = env!("CARGO_PKG_RUST_VERSION");
     let run_anyway = args.iter().any(|a| a == "--compile-fail");