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.
// @dart=2.9
/*@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);

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

  foo(/*@ returnType=Null */ (/*@ type=Object* */ x) {
    return null;
  });
  foo(/*@ returnType=Null */ (/*@ type=Object* */ x) {
    throw "not implemented";
  });
}

main() {}