https://git.ruby-lang.org/ruby.git/commit/?id=20bf397f7c

From 20bf397f7cebd8156d76941dd54659cf9b8c8fe7 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@r...>
Date: Sat, 29 May 2021 14:04:25 +0900
Subject: merge revision(s) fd8991f797c145615820b4c76e6b7ac5a71339ea: [Backport
 #17889]

	Fix lazy enumerator with index size

	Fixes [Bug #17889]
	---
	 enumerator.c                      | 7 ++++++-
	 test/ruby/test_lazy_enumerator.rb | 4 ++++
	 2 files changed, 10 insertions(+), 1 deletion(-)
---
 enumerator.c                      | 7 ++++++-
 test/ruby/test_lazy_enumerator.rb | 4 ++++
 version.h                         | 2 +-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/enumerator.c b/enumerator.c
index b4a7cb5..90d2ec4 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -2678,8 +2678,13 @@ lazy_with_index_proc(VALUE proc_entry, struct MEMO* result, VALUE memos, long me https://github.com/ruby/ruby/blob/trunk/enumerator.c#L2678
     return result;
 }
 
+static VALUE
+lazy_with_index_size(VALUE proc, VALUE receiver) {
+    return receiver;
+}
+
 static const lazyenum_funcs lazy_with_index_funcs = {
-    lazy_with_index_proc, 0,
+    lazy_with_index_proc, lazy_with_index_size,
 };
 
 /*
diff --git a/test/ruby/test_lazy_enumerator.rb b/test/ruby/test_lazy_enumerator.rb
index 3f5a055..2116d0e 100644
--- a/test/ruby/test_lazy_enumerator.rb
+++ b/test/ruby/test_lazy_enumerator.rb
@@ -682,4 +682,8 @@ EOS https://github.com/ruby/ruby/blob/trunk/test/ruby/test_lazy_enumerator.rb#L682
     ary = (0..Float::INFINITY).lazy.with_index.take(2).to_a
     assert_equal([[0, 0], [1, 1]], ary)
   end
+
+  def test_with_index_size
+    assert_equal(3, Enumerator::Lazy.new([1, 2, 3], 3){|y, v| y << v}.with_index.size)
+  end
 end
diff --git a/version.h b/version.h
index 21e0ab9..381a953 100644
--- a/version.h
+++ b/version.h
@@ -12,7 +12,7 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L12
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 2
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 89
+#define RUBY_PATCHLEVEL 90
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 5
-- 
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