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diff --git a/test/FrontendC/2004-02-13-IllegalVararg.c b/test/FrontendC/2004-02-13-IllegalVararg.c
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--- /dev/null
+++ b/test/FrontendC/2004-02-13-IllegalVararg.c
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+// RUN: %llvmgcc -xc %s -w -c -o - | llc
+// XFAIL: *
+// See PR2452
+
+#include <stdarg.h>
+
+float test(int X, ...) {
+  va_list ap;
+  float F;
+  va_start(ap, X);
+  F = va_arg(ap, float);
+  return F;
+}