Fix null aware generic invocation.

lib/src/compiler/ast_builder.dart

 // Copyright (c) 2015, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:logging/logging.dart' as logger;
 
@@ skipping 87 matching lines @@
         exp is MethodInvocation) return exp;
     return parenthesizedExpression(exp);
   }
 
   static PropertyAccess propertyAccess(
       Expression target, SimpleIdentifier name) {
     var p = new Token(TokenType.PERIOD, 0);
     return new PropertyAccess(target, p, name);
   }
 
-  static MethodInvocation methodInvoke(
-      Expression target, SimpleIdentifier name, NodeList<Expression> args) {
+  static MethodInvocation methodInvoke(Expression target, SimpleIdentifier name,
+      TypeArgumentList typeArguments, NodeList<Expression> args) {
     var p = new Token(TokenType.PERIOD, 0);
-    return new MethodInvocation(target, p, name, null, argumentList(args));
+    return new MethodInvocation(
+        target, p, name, typeArguments, argumentList(args));
   }
 
   static TokenType getTokenType(String lexeme) {
     switch (lexeme) {
       case "&":
         return TokenType.AMPERSAND;
       case "&&":
         return TokenType.AMPERSAND_AMPERSAND;
       case "&=":
         return TokenType.AMPERSAND_EQ;
@@ skipping 468 matching lines @@
     Label l = new Label(s, new Token(TokenType.COLON, 0));
     return new NamedExpression(l, e);
   }
 
   static VariableDeclarationStatement variableDeclarationStatement(
       VariableDeclarationList varDecl) {
     var semi = new Token(TokenType.SEMICOLON, 0);
     return new VariableDeclarationStatement(varDecl, semi);
   }
 }