Implement Ty::is_enum using matches!

Author: tmiasko

compiler/rustc_middle/src/ty/sty.rs

@@ -1837,10 +1837,7 @@ impl<'tcx> TyS<'tcx> {
 
     #[inline]
     pub fn is_enum(&self) -> bool {
-        match self.kind() {
-            Adt(adt_def, _) => adt_def.is_enum(),
-            _ => false,
-        }
+        matches!(self.kind(), Adt(adt_def, _) if adt_def.is_enum())
     }
 
     #[inline]