llvm-project/clang/test/SemaCXX/function-redecl-2.cpp

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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
namespace redecl_in_templ {
template<typename T> void redecl_in_templ() {
extern void func_1(); // expected-note {{previous declaration is here}}
extern int func_1(); // expected-error {{functions that differ only in their return type cannot be overloaded}}
}
void g();
constexpr void (*p)() = g;
template<bool> struct X {};
template<> struct X<true> { typedef int type; };
template<typename T> void f() {
extern void g();
X<&g == p>::type n;
}
}