https://git.ruby-lang.org/ruby.git/commit/?id=c767618d4c

From c767618d4c3319c60155ee2c56450ed7e933b596 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 1 Oct 2022 15:36:01 +0900
Subject: Do not define the method only for RDoc

`Data.members` fails an assertion.
---
 struct.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/struct.c b/struct.c
index 57d7cffc30..a025d21af6 100644
--- a/struct.c
+++ b/struct.c
@@ -2167,7 +2167,9 @@ InitVM_Struct(void) https://github.com/ruby/ruby/blob/trunk/struct.c#L2167
     rb_undef_alloc_func(rb_cData);
     rb_define_singleton_method(rb_cData, "define", rb_data_s_def, -1);
 
+#if 0 /* for RDoc */
     rb_define_singleton_method(rb_cData, "members", rb_data_s_members_m, 0);
+#endif
 
     rb_define_method(rb_cData, "initialize", rb_data_initialize_m, -1);
     rb_define_method(rb_cData, "initialize_copy", rb_struct_init_copy, 1);
-- 
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