class.c: call `method_added` hooks on alias definitions; #2339

src/class.c

@@ -2282,6 +2282,8 @@ mrb_mod_to_s(mrb_state *mrb, mrb_value klass)
   }
 }
 
+void mrb_method_added(mrb_state *mrb, struct RClass *c, mrb_sym mid);
+
 static mrb_value
 mrb_mod_alias(mrb_state *mrb, mrb_value mod)
 {
@@ -2290,6 +2292,7 @@ mrb_mod_alias(mrb_state *mrb, mrb_value mod)
 
   mrb_get_args(mrb, "nn", &new_name, &old_name);
   mrb_alias_method(mrb, c, new_name, old_name);
+  mrb_method_added(mrb, c, new_name);
   return mod;
 }
 

src/vm.c

@@ -2921,7 +2921,8 @@ RETRY_TRY_BLOCK:
       if (!check_target_class(mrb)) goto L_RAISE;
       target = mrb_vm_ci_target_class(mrb->c->ci);
       mrb_alias_method(mrb, target, syms[a], syms[b]);
-      NEXT;
+      mrb_method_added(mrb, target, syms[a]);
+     NEXT;
     }
     CASE(OP_UNDEF, B) {
       struct RClass *target;