| // RUN: %clang -fsyntax-only -std=c++2a -Xclang -verify -ftemplate-depth=5 -ftemplate-backtrace-limit=4 %s |
| |
| // RequiresExpr contains invalid requirement. (Eg. Highly recurisive template). |
| template<int x> |
| struct A { static constexpr bool far(); }; |
| class B { |
| bool data_member; |
| friend struct A<1>; |
| }; |
| |
| template<> |
| constexpr bool A<0>::far() { return true; } |
| |
| template<int x> |
| constexpr bool A<x>::far() { |
| return requires(B b) { |
| b.data_member; |
| requires A<x-1>::far(); // #Invalid |
| // expected-error@#Invalid {{recursive template instantiation exceeded maximum depth}} |
| // expected-note@#Invalid {{in instantiation}} |
| // expected-note@#Invalid 2 {{while}} |
| // expected-note@#Invalid {{contexts in backtrace}} |
| // expected-note@#Invalid {{increase recursive template instantiation depth}} |
| }; |
| } |
| static_assert(A<1>::far()); |
| static_assert(!A<6>::far()); // expected-note {{in instantiation of member function}} |
