Merge pull request #317 from masamitsu-murase/fix_struct_new_gc

Fix GC of struct

src/gc.c

@@ -514,6 +514,12 @@ obj_free(mrb_state *mrb, struct RBasic *obj)
     mrb_free(mrb, ((struct RRange*)obj)->edges);
     break;
 
+#ifdef ENABLE_STRUCT
+  case MRB_TT_STRUCT:
+    mrb_free(mrb, ((struct RStruct*)obj)->ptr);
+    break;
+#endif
+
   case MRB_TT_DATA:
     {
       struct RData *d = (struct RData*)obj;
@@ -632,6 +638,15 @@ gc_gray_mark(mrb_state *mrb, struct RBasic *obj)
     break;
 #endif
 
+#ifdef ENABLE_STRUCT
+  case MRB_TT_STRUCT:
+    {
+      struct RStruct *s = (struct RStruct*)obj;
+      children += s->len;
+    }
+    break;
+#endif
+
   default:
     break;
   }