From 65285bf673914424e960671d1d35e357c455985e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 24 Sep 2021 00:55:11 +0900
Subject: Consider modified modules initialized [Bug #18185]

---
 eval.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'eval.c')

diff --git a/eval.c b/eval.c
index 60387f6e06..880c63b88f 100644
--- a/eval.c
+++ b/eval.c
@@ -424,6 +424,9 @@ rb_class_modify_check(VALUE klass)
     if (SPECIAL_CONST_P(klass)) {
 	Check_Type(klass, T_CLASS);
     }
+    if (RB_TYPE_P(klass, T_MODULE)) {
+        rb_module_set_initialized(klass);
+    }
     if (OBJ_FROZEN(klass)) {
 	const char *desc;
 
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