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// RUN: %clang_cc1 -std=c++20 -fsyntax-only -verify %s export module m3; export template <class> struct X { template <class Self> friend void f(Self &&self) { (Self&)self; // expected-warning {{expression result unused}} } }; void g() { f(X<void>{}); } // expected-note {{in instantiation of function template specialization}}