clang/test/SemaCXX/gh65522.cpp

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