clang/test/SemaCXX/lookup-template-name-extern-CXX.cpp

   1 // Tests that the lookup in transparent declaration context
   2 // (linkage specifiaction context) wouldn't cause compiler crash.
   3 // RUN: %clang_cc1 -std=c++20 %s -fsyntax-only -verify
   4 extern "C++" {
   5 template <class T>
   6 class X {}; // expected-note {{candidate template ignored: couldn't infer template argument 'T'}} \
   7             // expected-note {{implicit deduction guide declared as 'template <class T> X(X<T>) -> X<T>'}} \
   8             // expected-note {{candidate function template not viable: requires 1 argument, but 0 were provided}} \
   9             // expected-note {{implicit deduction guide declared as 'template <class T> X() -> X<T>'}}
  10 }
  11
  12 void foo() {
  13   X x; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'X'}}
  14 }