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38cf47f037
Per CWG 2672 substitution failure within the body of a lambda inside a requires-expression should be a hard error. Fixes https://github.com/llvm/llvm-project/issues/64138 Reviewed By: cor3ntin Differential Revision: https://reviews.llvm.org/D156993
192 lines
6.3 KiB
C++
192 lines
6.3 KiB
C++
// RUN: %clang_cc1 -std=c++20 %s -Wno-c++23-extensions -verify
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// RUN: %clang_cc1 -std=c++23 %s -verify
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template <auto> struct Nothing {};
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Nothing<[]() { return 0; }()> nothing;
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template <typename> struct NothingT {};
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Nothing<[]() { return 0; }> nothingT;
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template <typename T>
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concept True = [] { return true; }();
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static_assert(True<int>);
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static_assert(sizeof([] { return 0; }));
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static_assert(sizeof([] { return 0; }()));
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void f() noexcept(noexcept([] { return 0; }()));
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using a = decltype([] { return 0; });
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using b = decltype([] { return 0; }());
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using c = decltype([]() noexcept(noexcept([] { return 0; }())) { return 0; });
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using d = decltype(sizeof([] { return 0; }));
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template <auto T>
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int unique_test1();
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static_assert(&unique_test1<[](){}> != &unique_test1<[](){}>);
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template <class T>
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auto g(T) -> decltype([]() { T::invalid; } ());
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auto e = g(0); // expected-error@-1{{type 'int' cannot be used prior to '::'}}
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// expected-note@-1{{while substituting deduced template}}
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// expected-note@-3{{while substituting into a lambda}}
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// expected-error@-3 {{no matching function for call to 'g'}}
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// expected-note@-5 {{substitution failure}}
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template <typename T>
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auto foo(decltype([] {
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return [] { return T(); }();
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})) {}
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void test() {
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foo<int>({});
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}
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template <typename T>
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struct C {
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template <typename U>
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auto foo(decltype([] {
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return [] { return T(); }();
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})) {}
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};
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void test2() {
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C<int>{}.foo<long>({});
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}
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namespace PR52073 {
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// OK, these are distinct functions not redefinitions.
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template<typename> void f(decltype([]{})) {} // expected-note {{candidate}}
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template<typename> void f(decltype([]{})) {} // expected-note {{candidate}}
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void use_f() { f<int>({}); } // expected-error {{ambiguous}}
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// Same.
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template<int N> void g(const char (*)[([]{ return N; })()]) {} // expected-note {{candidate}}
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template<int N> void g(const char (*)[([]{ return N; })()]) {} // expected-note {{candidate}}
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void use_g() { g<6>(&"hello"); } // expected-error {{ambiguous}}
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}
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namespace GH51416 {
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template <class T>
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struct A {
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void spam(decltype([] {}));
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};
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template <class T>
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void A<T>::spam(decltype([] {})) // expected-error{{out-of-line definition of 'spam' does not match}}
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{}
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struct B {
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template <class T>
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void spam(decltype([] {}));
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};
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template <class T>
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void B::spam(decltype([] {})) {} // expected-error{{out-of-line definition of 'spam' does not match}}
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} // namespace GH51416
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namespace GH50376 {
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template <typename T, typename Fn>
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struct foo_t { // expected-note 2{{candidate constructor}}
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foo_t(T ptr) {} // expected-note{{candidate constructor}}
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};
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template <typename T>
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using alias = foo_t<T, decltype([](int) { return 0; })>;
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template <typename T>
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auto fun(T const &t) -> alias<T> {
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return alias<T>{t}; // expected-error{{no viable conversion from returned value of type 'alias<...>'}}
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}
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void f() {
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int i;
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auto const error = fun(i); // expected-note{{in instantiation}}
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}
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} // namespace GH50376
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namespace GH51414 {
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template <class T> void spam(decltype([] {}) (*s)[sizeof(T)] = nullptr) {}
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void foo() {
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spam<int>();
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}
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} // namespace GH51414
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namespace GH51641 {
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template <class T>
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void foo(decltype(+[](T) {}) lambda, T param);
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static_assert(!__is_same(decltype(foo<int>), void));
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} // namespace GH51641
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namespace StaticLambdas {
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template <auto> struct Nothing {};
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Nothing<[]() static { return 0; }()> nothing;
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template <typename> struct NothingT {};
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Nothing<[]() static { return 0; }> nothingT;
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template <typename T>
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concept True = [] static { return true; }();
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static_assert(True<int>);
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static_assert(sizeof([] static { return 0; }));
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static_assert(sizeof([] static { return 0; }()));
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void f() noexcept(noexcept([] static { return 0; }()));
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using a = decltype([] static { return 0; });
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using b = decltype([] static { return 0; }());
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using c = decltype([]() static noexcept(noexcept([] { return 0; }())) { return 0; });
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using d = decltype(sizeof([] static { return 0; }));
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}
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namespace lambda_in_trailing_decltype {
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auto x = ([](auto) -> decltype([] {}()) {}(0), 2);
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}
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namespace lambda_in_constraints {
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struct WithFoo { static void foo(); };
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template <class T>
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concept lambda_works = requires {
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[]() { T::foo(); }; // expected-error{{type 'int' cannot be used prior to '::'}}
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// expected-note@-1{{while substituting into a lambda expression here}}
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// expected-note@-2{{in instantiation of requirement here}}
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// expected-note@-4{{while substituting template arguments into constraint expression here}}
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};
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static_assert(!lambda_works<int>); // expected-note {{while checking the satisfaction of concept 'lambda_works<int>' requested here}}
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static_assert(lambda_works<WithFoo>);
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template <class T>
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int* func(T) requires requires { []() { T::foo(); }; }; // expected-error{{type 'int' cannot be used prior to '::'}}
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// expected-note@-1{{while substituting into a lambda expression here}}
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// expected-note@-2{{in instantiation of requirement here}}
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// expected-note@-3{{while substituting template arguments into constraint expression here}}
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double* func(...);
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static_assert(__is_same(decltype(func(0)), double*)); // expected-note {{while checking constraint satisfaction for template 'func<int>' required here}}
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// expected-note@-1 {{in instantiation of function template specialization 'lambda_in_constraints::func<int>'}}
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static_assert(__is_same(decltype(func(WithFoo())), int*));
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template <class T>
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auto direct_lambda(T) -> decltype([] { T::foo(); }) {}
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void direct_lambda(...) {}
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void recursive() {
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direct_lambda(0); // expected-error@-4 {{type 'int' cannot be used prior to '::'}}
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// expected-note@-1 {{while substituting deduced template arguments}}
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// expected-note@-6 {{while substituting into a lambda}}
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bool x = requires { direct_lambda(0); }; // expected-error@-7 {{type 'int' cannot be used prior to '::'}}
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// expected-note@-1 {{while substituting deduced template arguments}}
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// expected-note@-9 {{while substituting into a lambda}}
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}
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}
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