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diff --git a/clang/test/CodeGen/enum.c b/clang/test/CodeGen/enum.c
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+++ b/clang/test/CodeGen/enum.c
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+// RUN: %clang_cc1 -triple i386-unknown-unknown %s -O3 -emit-llvm -o - | grep 'ret i32 6'
+// RUN: %clang_cc1 -triple i386-unknown-unknown -x c++ %s -O3 -emit-llvm -o - | grep 'ret i32 7'
+
+// This test case illustrates a peculiarity of the promotion of
+// enumeration types in C and C++. In particular, the enumeration type
+// "z" below promotes to an unsigned int in C but int in C++.
+static enum { foo, bar = 1U } z;
+
+int main (void)
+{
+  int r = 0;
+
+  if (bar - 2 < 0)
+    r += 4;
+  if (foo - 1 < 0)
+    r += 2;
+  if (z - 1 < 0)
+    r++;
+
+  return r;
+}
+