https://git.ruby-lang.org/ruby.git/commit/?id=bcf4b236e4

From bcf4b236e424ce0e6055f4a9651b5369a830866a Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Sun, 20 Dec 2020 04:22:13 +0900
Subject: ext/racc/cparse is ractor-safe


diff --git a/ext/racc/cparse/cparse.c b/ext/racc/cparse/cparse.c
index 8fa1069..8614c10 100644
--- a/ext/racc/cparse/cparse.c
+++ b/ext/racc/cparse/cparse.c
@@ -819,6 +819,10 @@ reduce0(RB_BLOCK_CALL_FUNC_ARGLIST(_, data)) https://github.com/ruby/ruby/blob/trunk/ext/racc/cparse/cparse.c#L819
 void
 Init_cparse(void)
 {
+#if HAVE_RB_EXT_RACTOR_SAFE
+    rb_ext_ractor_safe(true);
+#endif
+
     VALUE Racc, Parser;
     ID id_racc = rb_intern_const("Racc");
 
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