1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 
11 // template<class F, class... Args>
12 // concept predicate;
13 
14 #include <concepts>
15 
check_subsumption(std::regular_invocable auto)16 constexpr bool check_subsumption(std::regular_invocable auto) {
17   return false;
18 }
19 
20 // clang-format off
21 template<class F>
22 requires std::predicate<F> && true
check_subsumption(F)23 constexpr bool check_subsumption(F)
24 {
25   return true;
26 }
27 // clang-format on
28 
__anon1663e0ad0102null29 static_assert(!check_subsumption([] {}));
__anon1663e0ad0202null30 static_assert(check_subsumption([] { return true; }));
31