gc should handle regexp and match objects

src/gc.c

@@ -369,6 +369,24 @@ gc_mark_children(mrb_state *mrb, struct RBasic *obj)
     }
     break;
 
+#ifdef INCLUDE_REGEXP
+  case MRB_TT_MATCH:
+    {
+      struct RMatch *m = (struct RMatch*)obj;
+
+      mrb_gc_mark(mrb, (struct RBasic*)m->str);
+      mrb_gc_mark(mrb, (struct RBasic*)m->regexp);
+    }
+    break;
+  case MRB_TT_REGEX:
+    {
+      struct RRegexp *r = (struct RRegexp*)obj;
+
+      mrb_gc_mark(mrb, (struct RBasic*)r->src);
+    }
+    break;
+#endif
+
   default:
     break;
   }
@@ -443,7 +461,7 @@ obj_free(mrb_state *mrb, struct RBasic *obj)
         d->type->dfree(mrb, d->data);
       }
     }
-          break;
+    break;
 
   default:
     break;
@@ -541,6 +559,15 @@ gc_gray_mark(mrb_state *mrb, struct RBasic *obj)
     children+=2;
     break;
 
+#ifdef INCLUDE_REGEXP
+  case MRB_TT_MATCH:
+    children+=2;
+    break;
+  case MRB_TT_REGEX:
+    children+=1;
+    break;
+#endif
+
   default:
     break;
   }