Fix generation of variable initializer synthetic functions in summary AST linker.

pkg/analyzer/test/src/summary/linker_test.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.
 
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:unittest/unittest.dart';
 
@@ skipping 705 matching lines @@
     ClassElementForLink_Class d = testLibrary.getContainedName('D');
     TypeParameterElementImpl t = c.typeParameters[0];
     TypeParameterElementImpl u = c.typeParameters[1];
     TypeParameterElementImpl v = d.typeParameters[0];
     TypeParameterElementImpl w = d.typeParameters[1];
     expect(c.isTypeParameterInScope(v), false);
     expect(c.isTypeParameterInScope(w), false);
     expect(d.isTypeParameterInScope(t), false);
     expect(d.isTypeParameterInScope(u), false);
   }
+
+  void test_variable_initializer_presence() {
+    // Any variable declaration with an initializer should have a non-null value
+    // for `initializer`, regardless of whether it is constant and regardless of
+    // whether it has an explicit type.
+    createLinker('''
+const int c = 0;
+int i = 0;
+int j;
+var v = 0;
+''');
+    LibraryElementForLink library = linker.getLibrary(linkerInputs.testDartUri);
+    PropertyAccessorElementForLink_Variable c = library.getContainedName('c');
+    expect(c.variable.initializer, isNotNull);
+    PropertyAccessorElementForLink_Variable i = library.getContainedName('i');
+    expect(i.variable.initializer, isNotNull);
+    PropertyAccessorElementForLink_Variable j = library.getContainedName('j');
+    expect(j.variable.initializer, isNull);
+    PropertyAccessorElementForLink_Variable v = library.getContainedName('v');
+    expect(v.variable.initializer, isNotNull);
+  }
 }