https://git.ruby-lang.org/ruby.git/commit/?id=8d76b729a1

From 8d76b729a180c47d8edf4392d84a02ec00aeb37b Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Sat, 26 Sep 2020 00:53:07 +0900
Subject: Put same frozen Range literal if possible

Range literal is now frozen so we can reuse same Range object if
the begin and the last are Numeric (frozen), such as `(1..2)`.

diff --git a/compile.c b/compile.c
index 0d2d7fb..7053837 100644
--- a/compile.c
+++ b/compile.c
@@ -8644,8 +8644,8 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, in https://github.com/ruby/ruby/blob/trunk/compile.c#L8644
 	VALUE flag = INT2FIX(excl);
 	const NODE *b = node->nd_beg;
 	const NODE *e = node->nd_end;
-        // TODO: Ractor can not use cached Range objects
-	if (0 && optimizable_range_item_p(b) && optimizable_range_item_p(e)) {
+
+        if (optimizable_range_item_p(b) && optimizable_range_item_p(e)) {
 	    if (!popped) {
                 VALUE bv = nd_type(b) == NODE_LIT ? b->nd_lit : Qnil;
                 VALUE ev = nd_type(e) == NODE_LIT ? e->nd_lit : Qnil;
-- 
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