use matches!() macro in more places

compiler/rustc_const_eval/src/const_eval/error.rs

@@ -25,10 +25,7 @@ pub enum ConstEvalErrKind {
 
 impl MachineStopType for ConstEvalErrKind {
     fn is_hard_err(&self) -> bool {
-        match self {
-            Self::Panic { .. } => true,
-            _ => false,
-        }
+        matches!(self, Self::Panic { .. })
     }
 }
 

compiler/rustc_const_eval/src/const_eval/fn_queries.rs

@@ -51,10 +51,8 @@ fn is_const_fn_raw(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
         // If the function itself is not annotated with `const`, it may still be a `const fn`
         // if it resides in a const trait impl.
         is_parent_const_impl_raw(tcx, hir_id)
-    } else if let hir::Node::Ctor(_) = node {
-        true
     } else {
-        false
+        matches!(node, hir::Node::Ctor(_))
     }
 }