|  | // TODO(multitest): This was automatically migrated from a multitest and may | 
|  | // contain strange or dead code. | 
|  |  | 
|  | // Copyright (c) 2018, 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. | 
|  |  | 
|  | /*@testedFeatures=inference*/ | 
|  | library test; | 
|  |  | 
|  | class A { | 
|  | late B b; | 
|  | } | 
|  |  | 
|  | class B { | 
|  | C? get c => null; | 
|  | void set c(C? value) {} | 
|  | } | 
|  |  | 
|  | class C {} | 
|  |  | 
|  | class D extends C {} | 
|  |  | 
|  | class E extends C {} | 
|  |  | 
|  | // Inferred type: A | 
|  | var a = new A(); | 
|  |  | 
|  | // Inferred type: C? | 
|  | var x = a.b.c; | 
|  |  | 
|  | // Inferred type: C | 
|  | var y = a.b.c ??= new D(); | 
|  |  | 
|  | test() { | 
|  | // Verify the types of x and y by trying to assign to them. | 
|  |  | 
|  |  | 
|  |  | 
|  |  | 
|  | y = new E(); | 
|  |  | 
|  | } | 
|  |  | 
|  | main() {} |