https://git.ruby-lang.org/ruby.git/commit/?id=8d378fd28b

From 8d378fd28bcce28013499454877678cbbfe7cdc9 Mon Sep 17 00:00:00 2001
From: manga_osyo <manga.osyo@g...>
Date: Thu, 25 Feb 2021 17:20:50 +0900
Subject: Add Enumerable::Lazy#with_index to NEWS-2.7.0 The behavior of
 `Enumerable::Lazy#with_index` has changed in Ruby 2.7. This change was not
 listed in the Ruby 2.7 news, so I added it.

---
 doc/NEWS-2.7.0 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/doc/NEWS-2.7.0 b/doc/NEWS-2.7.0
index 184b47fb8b7..7607a473de7 100644
--- a/doc/NEWS-2.7.0
+++ b/doc/NEWS-2.7.0
@@ -357,6 +357,16 @@ See also Warning in {Core classes updates}[#label-Core+classes+updates+-28outsta https://github.com/ruby/ruby/blob/trunk/doc/NEWS-2.7.0#L357
       can be directly passed to another method as a block
       argument.  [Feature #15618]
 
+    * Added Enumerator::Lazy#with_index be lazy
+      Previously, Enumerator::Lazy#with_index was not defined, so it
+      picked up the default implementation from Enumerator, which was
+      not lazy.  [Bug #7877]
+
+        ("a"..).lazy.with_index(1) { |it, index| puts "#{index}:#{it}" }.take(3).force
+        # => 1:a
+        #    2:b
+        #    3:c
+
 [Fiber]
 
   [New method]
-- 
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