https://git.ruby-lang.org/ruby.git/commit/?id=cd41378ef9

From cd41378ef906c279ee925a0f5d6ba3bf606953db Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Fri, 16 Aug 2019 11:36:47 +0900
Subject: lib/rdoc/parser/ruby.rb: Avoid `.chars.to_a.last`

The code creates a lot of useless objects.
Instead, using a regexp is shorter and faster.

diff --git a/lib/rdoc/parser/ruby.rb b/lib/rdoc/parser/ruby.rb
index 8da19cf..4d6c038 100644
--- a/lib/rdoc/parser/ruby.rb
+++ b/lib/rdoc/parser/ruby.rb
@@ -1779,9 +1779,9 @@ class RDoc::Parser::Ruby < RDoc::Parser https://github.com/ruby/ruby/blob/trunk/lib/rdoc/parser/ruby.rb#L1779
           while tk and (:on_comment == tk[:kind] or :on_embdoc == tk[:kind]) do
             comment_body = retrieve_comment_body(tk)
             comment += comment_body
-            comment += "\n" unless "\n" == comment_body.chars.to_a.last
+            comment << "\n" unless comment_body =~ /\n\z/
 
-            if comment_body.size > 1 && "\n" == comment_body.chars.to_a.last then
+            if comment_body.size > 1 && comment_body =~ /\n\z/ then
               skip_tkspace_without_nl # leading spaces
             end
             tk = get_tk
-- 
cgit v0.10.2


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