--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr67730.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,32 @@
+#pragma GCC system_header
+#define NULL (void *) 0
+#define ONEP (void *) 1
+#define RETURN return NULL
+
+extern void sysbar (unsigned char *);
+
+unsigned char *
+sysfn1 (void *p)
+{
+   unsigned char *uc = ONEP;
+   uc = ONEP;
+   sysbar (ONEP);
+   return ONEP;
+}
+
+extern void sysbar2 (int);
+
+int
+sysfn2 (void)
+{
+  int a = NULL;
+  a = NULL;
+  sysbar2 (NULL);
+  return NULL;
+}
+
+int
+sysfn3 (void)
+{
+  RETURN;
+}