pkg/front_end/testcases/inference/block_bodied_lambdas_infer_bottom_sync.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.

/*@testedFeatures=inference*/
library test;

var h = null;
void foo(int? f(Object _)) {}

test() {
  var /*@type=(Object) -> Null*/ f = /*@ returnType=Null */ (Object x) {
    return null;
  };
  String? y = f(42);

  // error:INVALID_CAST_FUNCTION_EXPR
  f = /*@ returnType=Null */ (/*@type=Object*/ x) => 'hello';

  foo(/*@returnType=Null*/ (/*@type=Object*/ x) {
    return null;
  });
  foo(/*@returnType=Never*/ (/*@type=Object*/ x) {
    throw "not implemented";
  });
}

main() {}