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diff --git a/libmudflap/testsuite/libmudflap.c/pass45-frag.c b/libmudflap/testsuite/libmudflap.c/pass45-frag.c
new file mode 100644
index 00000000..c6bfeb50
--- /dev/null
+++ b/libmudflap/testsuite/libmudflap.c/pass45-frag.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern void h (const char *p, const char *f);
+int
+main (void)
+{
+  h (0, "foo");
+  return 0;
+}
+
+void
+h (const char *p, const char *f)
+{
+  size_t pl = p == NULL ? 0 : strlen (p);
+  size_t fl = strlen (f) + 1;
+  char a[pl + 1 + fl];
+  char *cp = a;
+  char b[pl + 5 + fl * 2];
+  char *cccp = b;
+  if (p != NULL)
+    {
+      cp = memcpy (cp, p, pl);
+      *cp++ = ':';
+    }
+  memcpy (cp, f, fl);
+  strcpy (b, a);
+  puts (a);
+}
+/* { dg-output "foo" } */