43 lines · cpp
1// RUN: %clang_cc1 -std=c++23 %s -verify2// RUN: %clang_cc1 -std=c++20 %s -verify3 4auto L0 = []<> { }; //expected-error {{cannot be empty}}5 6auto L1 = []<typename T1, typename T2> { };7auto L2 = []<typename T1, typename T2>(T1 arg1, T2 arg2) -> T1 { };8auto L3 = []<typename T>(auto arg) { T t; };9auto L4 = []<int I>() { };10 11// http://llvm.org/PR4973612auto L5 = []<auto>(){};13auto L6 = []<auto>{};14auto L7 = []<auto>() noexcept {};15auto L8 = []<auto> noexcept {};16#if __cplusplus <= 202002L17// expected-warning@-2 {{lambda without a parameter clause is a C++23 extension}}18#endif19auto L9 = []<auto> requires true {};20auto L10 = []<auto> requires true(){};21auto L11 = []<auto> requires true() noexcept {};22auto L12 = []<auto> requires true noexcept {};23#if __cplusplus <= 202002L24// expected-warning@-2 {{is a C++23 extension}}25#endif26auto L13 = []<auto>() noexcept requires true {};27auto L14 = []<auto> requires true() noexcept requires true {};28 29auto XL0 = []<auto> noexcept requires true {}; // expected-error {{expected body of lambda expression}}30auto XL1 = []<auto> requires true noexcept requires true {}; // expected-error {{expected body}}31#if __cplusplus <= 202002L32// expected-warning@-3 {{is a C++23 extension}}33// expected-warning@-3 {{is a C++23 extension}}34#endif35 36namespace GH64962 {37void f() {38 [] <typename T>(T i) -> int[] // expected-error {{function cannot return array type 'int[]'}}39 // extension-warning {{explicit template parameter list for lambdas is a C++20 extension}}40 { return 3; } (v); // expected-error {{use of undeclared identifier 'v'}}41}42}43