69 lines · cpp
1// RUN: %clang_cc1 -std=c++2a -verify %s2 3template<typename T, typename U>4constexpr bool is_same_v = false;5 6template<typename T>7constexpr bool is_same_v<T, T> = true;8 9using T = void ();10 11void f1non_templ(int a) requires true; // expected-error{{non-templated function cannot have a requires clause}}12auto f2non_templ(int a) -> bool requires true; // expected-error{{non-templated function cannot have a requires clause}}13auto f3non_templ(int a) -> bool (*)(int b) requires true; // expected-error{{non-templated function cannot have a requires clause}}14// expected-error@+1{{non-templated function cannot have a requires clause}}15auto f4_non_templ(int a) requires true -> bool; // expected-error{{trailing return type must appear before trailing requires clause}}16void (f7non_templ()) requires true; // expected-error{{non-templated function cannot have a requires clause}}17// expected-error@+1{{non-templated function cannot have a requires clause}}18void (f8non_templ() requires true); // expected-error{{trailing requires clause should be placed outside parentheses}}19// expected-error@+1{{non-templated function cannot have a requires clause}}20T xnon_templ requires true;21// expected-error@+2 2{{non-templated function cannot have a requires clause}}22struct Snon_templ {23 T m1 requires true, m2 requires true;24};25 26template <typename>27void f1(int a)28 requires true; // OK29 30template <typename>31auto f2(int a) -> bool32 requires true; // OK33 34template <typename>35auto f3(int a) -> bool (*)(int b) requires true; // OK36template <typename>37auto f4(int a) requires true -> bool; // expected-error{{trailing return type must appear before trailing requires clause}}38int f5(int a) requires; // expected-error{{expected expression}}39int f6(int a) requires {} // expected-error{{expected expression}}40template<typename>41void (f7()) requires true;42template<typename>43void (f8() requires true); // expected-error{{trailing requires clause should be placed outside parentheses}}44void (*(f9 requires (true)))(); // expected-error{{trailing requires clause should be placed outside parentheses}}45static_assert(is_same_v<decltype(f9), void (*)()>);46void (*pf)() requires true; // expected-error{{trailing requires clause can only be used when declaring a function}}47void g1(int (*dsdads)() requires false); // expected-error{{trailing requires clause can only be used when declaring a function}}48void g2(int (*(*dsdads)())() requires true); // expected-error{{trailing requires clause can only be used when declaring a function}}49void g3(int (*(*dsdads)(int) requires true)() ); // expected-error{{trailing requires clause should be placed outside parentheses}}50 51template<typename U>52struct Foo{53T x requires true;54};55Foo<int> f;56 57template<typename>58struct S {59 T m1 requires true, m2 requires true;60};61 62template<typename T>63struct R {64 R(T t);65};66 67template<typename T>68R(T) -> R<T> requires true;69