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-rw-r--r--clang/test/Preprocessor/mi_opt.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/clang/test/Preprocessor/mi_opt.c b/clang/test/Preprocessor/mi_opt.c
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--- /dev/null
+++ b/clang/test/Preprocessor/mi_opt.c
@@ -0,0 +1,11 @@
+// RUN: not %clang_cc1 -fsyntax-only %s
+// PR1900
+// This test should get a redefinition error from m_iopt.h: the MI opt
+// shouldn't apply.
+
+#define MACRO
+#include "mi_opt.h"
+#undef MACRO
+#define MACRO || 1
+#include "mi_opt.h"
+