Language/Generics/syntax_t28.dart

// Copyright (c) 2019, 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

/// @assertion A generic type alias is a declaration [D] of one of the following
/// forms:
///    m typedef id<X1extendsB1, ..., Xs extendsBs> = T;
/// ...
/// where [m] is derived from metadata, [T] is a type, and [S?] is a type or the
/// empty string. Let [S0] be [S?] if it is a type, otherwise let [S0] be
/// [dynamic]. The associated type of [D], call it [F], is, respectively:
///   T
/// ...
/// @description Checks that [T] should be a type.
/// @author iarkh@unipro.ru

my_function<T>() {}

class C1<T> {
  C1(T i) {}
}

class C2<T> {
  C2(int, [T j]) {}
}

class C3<T1, T2> {
  C3({T1 i, T2 j}) {}
}

typedef Alias3<T> = my_function();          //# 01: syntax error
typedef Alias4<T> = my_function<T>();       //# 02: syntax error

typedef CAlias1<T> = C1<T>(T);              //# 03: syntax error
typedef CAlias2<T> = C2<T>(int, [T]);       //# 04: syntax error
typedef CAlias3<T1, T2> = C3<T>({T1, T2});  //# 05: syntax error

typedef CAlias4<T extends int> = C1<T>(24); //# 06: syntax error

main() {}