add test for value set failure

regression/cbmc/struct11/main.c

@@ -0,0 +1,42 @@
+#include <assert.h>
+
+struct prefix
+{
+  int integer;
+  int *p;
+};
+
+struct full_struct
+{
+  int integer;
+  int *p;
+  int something_else;
+};
+
+void full_to_prefix()
+{
+  int some_int=1;
+  struct full_struct f_s;
+  f_s.integer=10;
+  f_s.p=&some_int;
+  struct prefix *prefix_p=(struct prefix *)&f_s;
+  assert(prefix_p->integer==10);
+  assert(*prefix_p->p==1);
+}
+
+void prefix_to_full()
+{
+  int some_int=1;
+  struct prefix prefix;
+  prefix.integer=10;
+  prefix.p=&some_int;
+  struct full_struct *f_s_p=(struct full_struct *)&prefix;
+  assert(f_s_p->integer==10);
+  assert(*f_s_p->p==1);
+}
+
+int main()
+{
+  full_to_prefix();
+  prefix_to_full();
+}

regression/cbmc/struct11/test.desc

@@ -0,0 +1,10 @@
+KNOWNBUG
+main.c
+
+^EXIT=0$
+^SIGNAL=0$
+^VERIFICATION SUCCESSFUL$
+--
+^warning: ignoring
+--
+The value sets fail to track the pointer