Disable non_exhaustive_omitted_patterns within matches! macro

Author: jplatte

library/core/src/macros/mod.rs

@@ -426,8 +426,10 @@ pub macro debug_assert_matches($($arg:tt)*) {
 #[macro_export]
 #[stable(feature = "matches_macro", since = "1.42.0")]
 #[rustc_diagnostic_item = "matches_macro"]
+#[allow_internal_unstable(non_exhaustive_omitted_patterns_lint, stmt_expr_attributes)]
 macro_rules! matches {
     ($expression:expr, $pattern:pat $(if $guard:expr)? $(,)?) => {
+        #[allow(non_exhaustive_omitted_patterns)]
         match $expression {
             $pattern $(if $guard)? => true,
             _ => false