llvm-project/clang/test/SemaCXX/unused-functions.cpp

// RUN: %clang_cc1 -std=c++11 -fsyntax-only -Wunused -verify %s
// expected-no-diagnostics

static int foo(int x) { return x; }

template<typename T>
T get_from_foo(T y) { return foo(y); }

int g(int z) { return get_from_foo(z); }

namespace { void f() = delete; }