Capture number of loops in PResult during parsing

parser.c

@@ -152,7 +152,7 @@ struct PResult parse_buffer(buffer_t *buffer)
     goto error;
   }
 
-  return (struct PResult){nodes, usable};
+  return (struct PResult){nodes, usable, loops};
 error:
   if (nodes)
     free(nodes);

parser.h

@@ -24,6 +24,7 @@ struct PResult
 {
   node_t *nodes;
   size_t size;
+  size_t labels;
 };
 
 char *ast_to_str(node_t *ast, size_t size);