Fix null aware generic invocation.

lib/src/compiler/code_generator.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 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' show Token, TokenType;
@@ skipping 4284 matching lines @@
     if (node is MethodInvocation) return node.operator;
     return null;
   }
 
   // TODO(jmesserly): this is dropping source location.
   Expression _stripNullAwareOp(Expression node, Expression newTarget) {
     if (node is PropertyAccess) {
       return AstBuilder.propertyAccess(newTarget, node.propertyName);
     } else {
       var invoke = node as MethodInvocation;
-      return AstBuilder.methodInvoke(
-          newTarget, invoke.methodName, invoke.argumentList.arguments);
+      return AstBuilder.methodInvoke(newTarget, invoke.methodName,
+          invoke.typeArguments, invoke.argumentList.arguments)
+        ..staticInvokeType = invoke.staticInvokeType;
     }
   }
 
   /// Everything in Dart is an Object and supports the 4 members on Object,
   /// so we have to use a runtime helper to handle values such as `null` and
   /// native types.
   ///
   /// For example `null.toString()` is legal in Dart, so we need to generate
   /// that as `dart.toString(obj)`.
   bool _isObjectMemberCall(Expression target, String memberName) {
@@ skipping 897 matching lines @@
 }
 
 bool isLibraryPrefix(Expression node) =>
     node is SimpleIdentifier && node.staticElement is PrefixElement;
 
 LibraryElement _getLibrary(AnalysisContext c, String uri) =>
     c.computeLibraryElement(c.sourceFactory.forUri(uri));
 
 bool _isDartRuntime(LibraryElement l) =>
     l.isInSdk && l.source.uri.toString() == 'dart:_runtime';