[tests] add variation on \ghost result type and assigns test

tests/spec/ghost_result_type.i

@@ -3,6 +3,12 @@
     int *f(void);
 */
 
+/*@ ghost
+  /@ assigns \result,*\result \from \nothing; @/
+  int \ghost * g(void);
+*/
+
 int main(void){
   //@ ghost int* p = f() ;
+  //@ ghost int \ghost* q = g() ;
 }

tests/spec/oracle/ghost_result_type.res.oracle

@@ -4,10 +4,18 @@
              assigns \result \from \nothing; @/
 int *f(void); */
 
+/*@ ghost
+/@ assigns \result, *\result;
+   assigns \result \from \nothing;
+   assigns *\result \from \nothing;
+ @/
+int \ghost *g(void); */
+
 int main(void)
 {
   int __retres;
   /*@ ghost int *p = f(); */
+  /*@ ghost int \ghost *q = g(); */
   __retres = 0;
   return __retres;
 }