llvm-project/clang/test/SemaCXX/warn-using-namespace-in-hea...

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// RUN: %clang_cc1 -fsyntax-only -Wheader-hygiene -verify %s
#include "warn-using-namespace-in-header.h"
namespace dont_warn {}
using namespace dont_warn;
// Warning is actually in the header but only the cpp file gets scanned.
// expected-warning {{using namespace directive in global context in header}}