14 lines · cpp
1// RUN: %clang_cc1 -std=c++20 -Wc++17-compat -verify -Wno-unused %s2 3class X {};4 5template<typename T>6class B3 { // expected-note {{candidate template ignored: could not match 'B3<T>' against 'int'}} \7 // expected-note {{implicit deduction guide declared as 'template <typename T> B3(B3<T>) -> B3<T>'}}8 template<X x> B3(T); // expected-warning 2{{non-type template parameter of type 'X' is incompatible with C++ standards before C++20}} \9 // expected-note {{candidate template ignored: couldn't infer template argument 'x'}} \10 // expected-note {{implicit deduction guide declared as 'template <typename T, X x> B3(T) -> B3<T>'}}11};12B3 b3 = 0; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'B3'}} \13 // expected-note {{while building implicit deduction guide first needed here}}14