1 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=builtin 2 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=nobuiltin -fno-builtin 3 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=nobuiltin -fno-builtin-std-move -fno-builtin-std-move_if_noexcept -fno-builtin-std-forward -fno-builtin-std-forward_like 4 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=nobuiltin -ffreestanding 5 // expected-no-diagnostics 6 7 int nobuiltin; 8 9 namespace std { move(T & x)10 template<typename T> constexpr T &&move(T &x) { return (T&&)nobuiltin; } move_if_noexcept(T & x)11 template<typename T> constexpr T &&move_if_noexcept(T &x) { return (T&&)nobuiltin; } forward(T & x)12 template<typename T> constexpr T &&forward(T &x) { return (T&&)nobuiltin; } forward_like(T & X)13 template<typename U, typename T> constexpr T &&forward_like(T &X) { return (T&&)nobuiltin; } 14 } 15 addr(T && r)16template<typename T> constexpr T *addr(T &&r) { return &r; } 17 18 int builtin; 19 static_assert(addr(std::move(builtin)) == &BUILTIN); 20 static_assert(addr(std::move_if_noexcept(builtin)) == &BUILTIN); 21 static_assert(addr(std::forward(builtin)) == &BUILTIN); 22 static_assert(addr(std::forward_like<int&>(builtin)) == &BUILTIN); 23