https://git.ruby-lang.org/ruby.git/commit/?id=f279d41847

From f279d41847e07949ca7ad3f2d3d5cbe9fa3aabf5 Mon Sep 17 00:00:00 2001
From: manga_osyo <manga.osyo@g...>
Date: Mon, 6 Dec 2021 10:04:12 +0900
Subject: Fix warning in `Lexer::Elem#[]`

Changed to use `#pos` `#event` `#tok` `#state` since using Lexer::Elem#[0~4] now gives a warning.
see: https://github.com/ruby/ruby/commit/8944009be7418614ce7d4077807ac2b60d4d5d85

https://github.com/ruby/reline/commit/9adbb9af32
---
 lib/irb/ruby-lex.rb | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/irb/ruby-lex.rb b/lib/irb/ruby-lex.rb
index f2069a2b5fd..29862f5507e 100644
--- a/lib/irb/ruby-lex.rb
+++ b/lib/irb/ruby-lex.rb
@@ -752,16 +752,16 @@ class RubyLex https://github.com/ruby/ruby/blob/trunk/lib/irb/ruby-lex.rb#L752
       end
       i += 1
     end
-    start_token.last.nil? ? '' : start_token.last
+    start_token.last.nil? ? nil : start_token.last
   end
 
   def process_literal_type(tokens = @tokens)
     start_token = check_string_literal(tokens)
     return nil if start_token == ""
 
-    case start_token.event
+    case start_token&.event
     when :on_tstring_beg
-      case start_token.tok
+      case start_token&.tok
       when ?"      then ?"
       when /^%.$/  then ?"
       when /^%Q.$/ then ?"
@@ -776,7 +776,7 @@ class RubyLex https://github.com/ruby/ruby/blob/trunk/lib/irb/ruby-lex.rb#L776
     when :on_qsymbols_beg then ?]
     when :on_symbols_beg  then ?]
     when :on_heredoc_beg
-      start_token.tok =~ /<<[-~]?(['"`])[_a-zA-Z0-9]+\1/
+      start_token&.tok =~ /<<[-~]?(['"`])[_a-zA-Z0-9]+\1/
       case $1
       when ?" then ?"
       when ?' then ?'
-- 
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