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diff --git a/test/Preprocessor/c99-6_10_3_4_p7.c b/test/Preprocessor/c99-6_10_3_4_p7.c
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+++ b/test/Preprocessor/c99-6_10_3_4_p7.c
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+// Example from C99 6.10.3.4p7
+
+// RUN: clang-cc -E %s | grep -F 'int j[] = { 123, 45, 67, 89,' &&
+// RUN: clang-cc -E %s | grep -F '10, 11, 12, };'
+
+#define t(x,y,z) x ## y ## z
+int j[] = { t(1,2,3), t(,4,5), t(6,,7), t(8,9,),
+t(10,,), t(,11,), t(,,12), t(,,) };
+
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