llvm-project/clang/test/PCH/chain-invalid-code.cpp

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// RUN: %clang_cc1 -fsyntax-only %s -chain-include %s -Wuninitialized -Wunused -verify
// Make sure there is no crash.
#ifndef HEADER
#define HEADER
#include "non-existent-header.h"
class A {
public:
~A();
};
class ForwardCls;
struct B {
ForwardCls f;
A a;
};
#else
static void test() {
int x; // expected-warning {{unused}}
B b;
}
#endif