1// RUN: not %clang_cc1 -fsyntax-only %s
2// PR1900
3// This test should get a redefinition error from m_iopt.h: the MI opt
4// shouldn't apply.
5
6#define MACRO
7#include "mi_opt.h"
8#undef MACRO
9#define MACRO || 1
10#include "mi_opt.h"
11
12