Support assignment of locals in analyzer2dart.

pkg/analyzer2dart/test/end2end_data.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.
 
 /// Test data for the end2end test.
 library test.end2end.data;
 
 import 'test_helper.dart' show Group;
 import 'test_helper.dart' as base show TestSpec;
 
@@ skipping 173 matching lines @@
   var a = 0;
   return a;
 }
 ''','''
 main() {
   return 0;
 }
 '''),
   ]),
 
+  const Group('Local variable writes', const <TestSpec>[
+    const TestSpec('''
+main() {
+  var a;
+  a = 10;
+  return a;
+}
+''', '''
+main() {
+  return 10;
+}
+'''),
+
+    const TestSpec('''
+main() {
+  var a = 0;
+  a = 10;
+  return a;
+}
+''', '''
+main() {
+  return 10;
+}
+'''),
+
+    const TestSpec('''
+main() {
+  var a = 0;
+  print(a);
+  a = "";
+  print(a);
+  return a;
+}
+'''),
+
+    const TestSpec('''
+main(a) {
+  print(a);
+  a = "";
+  print(a);
+  return a;
+}
+'''),
+
+    const TestSpec('''
+main(a) {
+  if (a) {
+    a = "";
+  }
+  print(a);
+  return a;
+}
+'''),
+  ]),
+
   const Group('Dynamic access', const <TestSpec>[
     const TestSpec('''
 main(a) {
   return a.foo;
 }
 '''),
 
     const TestSpec('''
 main() {
   var a = "";
@@ skipping 249 matching lines @@
 }
 '''),
 
 const TestSpec('''
 main(a) {
   new Deprecated("");
 }
 '''),
   ]),
 ];