https://git.ruby-lang.org/ruby.git/commit/?id=aad88cc10b

From aad88cc10ba268625aaa93ddcc6ff5036052c5cd Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Wed, 23 Dec 2020 16:51:16 +0900
Subject: [ruby/date] Define dummy RUBY_TYPED_FROZEN_SHAREABLE for old Ruby

https://github.com/ruby/date/commit/9f3e90ad10

diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index 38deba6..7e9bf16 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -2973,6 +2973,10 @@ d_lite_memsize(const void *ptr) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L2973
     return complex_dat_p(dat) ? sizeof(struct ComplexDateData) : sizeof(struct SimpleDateData);
 }
 
+#ifndef HAVE_RB_EXT_RACTOR_SAFE
+#   define RUBY_TYPED_FROZEN_SHAREABLE 0
+#endif
+
 static const rb_data_type_t d_lite_type = {
     "Date",
     {d_lite_gc_mark, RUBY_TYPED_DEFAULT_FREE, d_lite_memsize,},
-- 
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