Revert "First step toward resolving generic function types" (TBR)

pkg/analyzer/lib/src/dart/ast/ast.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.ast.ast;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/syntactic_entity.dart';
@@ skipping 5682 matching lines @@
    * The type parameters for the function type, or `null` if the function type
    * does not have any type parameters.
    */
   TypeParameterList _typeParameters;
 
   /**
    * The parameters associated with the function type.
    */
   FormalParameterList _parameters;
 
-  @override
-  DartType type;
-
   /**
    * Initialize a newly created generic function type.
    */
   GenericFunctionTypeImpl(
       TypeAnnotationImpl returnType,
       this.functionKeyword,
       TypeParameterListImpl typeParameters,
       FormalParameterListImpl parameters) {
     _returnType = _becomeParentOf(returnType);
     _typeParameters = _becomeParentOf(typeParameters);
@@ skipping 23 matching lines @@
   }
 
   @override
   TypeAnnotation get returnType => _returnType;
 
   @override
   void set returnType(TypeAnnotation type) {
     _returnType = _becomeParentOf(type as AstNodeImpl);
   }
 
+  @override
+  DartType get type => null;
+
   /**
    * Return the type parameters for the function type, or `null` if the function
    * type does not have any type parameters.
    */
   TypeParameterList get typeParameters => _typeParameters;
 
   /**
    * Set the type parameters for the function type to the given list of
    * [typeParameters].
    */
@@ skipping 5709 matching lines @@
 
   @override
   dynamic/*=E*/ accept/*<E>*/(AstVisitor/*<E>*/ visitor) =>
       visitor.visitYieldStatement(this);
 
   @override
   void visitChildren(AstVisitor visitor) {
     _expression?.accept(visitor);
   }
 }