test/CodeGen/Inputs/debug-info-slash.h - llvm-project/clang - Git at Google

 template <typename... T>
 void f1() {}
 void a() {
   auto Lambda = [] {};
   f1<decltype(Lambda)>();
 }
	template <typename... T>
	void f1() {}
	void a() {
	auto Lambda = [] {};
	f1<decltype(Lambda)>();
	}