LanguageFeatures/nnbd/static_errors_A33_t13.dart

/*
 * Copyright (c) 2020, 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.
 */
/**
 * @assertion It is a warning to use the null check operator (!) on an
 * expression of type T if T is strictly non-nullable
 *
 * @description It is a warning to use the null check operator (!) on an
 * expression of type T if T is strictly non-nullable. Test generic function
 * type
 * @author sgrekhov@unipro.ru
 */

void foo<T>() {}
typedef void Foo<T>();

main() {
  Function f1 = foo;
  f1!;
//^
// [cfe] Operand of null-aware operation '!' has type 'Function' which excludes null.
//  ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION

  Foo f2 = foo;
  f2!;
//^
// [cfe] Operand of null-aware operation '!' has type 'void Function()' which excludes null.
//  ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION

  foo!<int>();
//^
// [cfe] Operand of null-aware operation '!' has type 'void Function<T>()' which excludes null.
//   ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
  foo!();
//^
// [cfe] Operand of null-aware operation '!' has type 'void Function<T>()' which excludes null.
//   ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
  f1!<int>();
//^
// [cfe] Operand of null-aware operation '!' has type 'Function' which excludes null.
//  ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
  f1!();
//^
// [cfe] Operand of null-aware operation '!' has type 'Function' which excludes null.
//  ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
  f2!();
//^
// [cfe] Operand of null-aware operation '!' has type 'void Function()' which excludes null.
//  ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
}