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
}