Fix for parsing generic function types with Fasta.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

 // Copyright (c) 2016, 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 fasta.analyzer.ast_builder;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast_factory.dart' show AstFactory;
 import 'package:analyzer/dart/ast/standard_ast_factory.dart' as standard;
 import 'package:analyzer/dart/ast/token.dart' as analyzer show Token;
@@ skipping 575 matching lines @@
     debugEvent("OptionalFormalParameters");
     push(new _OptionalFormalParameters(popList(count), beginToken, endToken));
   }
 
   void handleValuedFormalParameter(Token equals, Token token) {
     debugEvent("ValuedFormalParameter");
     Expression value = pop();
     push(new _ParameterDefaultValue(equals, value));
   }
 
+  void handleFunctionType(Token functionToken, Token semicolon) {
+    debugEvent("FunctionType");
+    FormalParameterList parameters = pop();
+    TypeParameterList typeParameters = pop();
+    TypeAnnotation returnType = pop();
+    push(ast.genericFunctionType(returnType, toAnalyzerToken(functionToken),
+        typeParameters, parameters));
+  }
+
   void handleFormalParameterWithoutValue(Token token) {
     debugEvent("FormalParameterWithoutValue");
     push(NullValue.ParameterDefaultValue);
   }
 
   void endFormalParameter(
       Token covariantKeyword, Token thisKeyword, FormalParameterType kind) {
     debugEvent("FormalParameter");
     _ParameterDefaultValue defaultValue = pop();
 
@@ skipping 877 matching lines @@
       } else if (identical('static', s)) {
         staticKeyword = token;
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else {
         internalError('Unhandled modifier: $s');
       }
     }
   }
 }