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-rw-r--r--clang/test/Preprocessor/macro_undef.c4
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diff --git a/clang/test/Preprocessor/macro_undef.c b/clang/test/Preprocessor/macro_undef.c
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+++ b/clang/test/Preprocessor/macro_undef.c
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+// RUN: %clang_cc1 -dM -undef -Dfoo=1 -E %s | FileCheck %s
+
+// CHECK-NOT: #define __clang__
+// CHECK: #define foo 1