pkg/front_end/testcases/inference/map_literals_can_infer_null.dart

// Copyright (c) 2017, 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.
// @dart=2.9
/*@testedFeatures=inference*/
library test;

test1() {
  var /*@ type=Map<Null, Null>* */ x = /*@ typeArgs=Null, Null */ {null: null};
  x /*@target=Map.[]=*/ [
      /*error:INVALID_CAST_LITERAL*/ 3] = /*error:INVALID_CAST_LITERAL*/ 'z';
}

main() {}