Store FunctionType(s) of local functions by value.

pkg/analyzer/lib/src/dart/element/element.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 4461 matching lines @@
   @override
   FunctionType get type {
     return _type ??=
         new FunctionTypeImpl.elementWithNameAndArgs(this, null, null, false);
   }
 
   @override
   void set type(FunctionType type) {
     assert(false);
   }
+
+  @override
+  List<UnlinkedTypeParam> get unlinkedTypeParams => _entityRef.typeParameters;
 }
 
 /**
  * A concrete implementation of a [FunctionTypeAliasElement].
  */
 class FunctionTypeAliasElementImpl extends ElementImpl
     with TypeParameterizedElementMixin
     implements FunctionTypeAliasElement {
   /**
    * The unlinked representation of the type in the summary.
@@ skipping 4385 matching lines @@
 
   @override
   DartObject computeConstantValue() => null;
 
   @override
   void visitChildren(ElementVisitor visitor) {
     super.visitChildren(visitor);
     _initializer?.accept(visitor);
   }
 }