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diff --git a/clang/test/Preprocessor/include-macros.c b/clang/test/Preprocessor/include-macros.c
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+// RUN: %clang_cc1 -E -Dtest=FOO -imacros %S/pr2086.h %s | grep 'HERE: test'
+
+// This should not be expanded into FOO because pr2086.h undefs 'test'.
+HERE: test