https://git.ruby-lang.org/ruby.git/commit/?id=8944009be7

From 8944009be7418614ce7d4077807ac2b60d4d5d85 Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman+foo@g...>
Date: Thu, 11 Nov 2021 08:59:29 -0600
Subject: Deprecate `Lexer::Elem#[]` and `Lexer::State#[]`

Discussed in https://github.com/ruby/ruby/pull/5093#issuecomment-964426481.

> it would be enough to mimic only [] for almost all cases

This adds back the `Lexer::Elem#[]` and `Lexer::State#[]` and adds deprecation warnings for them.
---
 ext/ripper/lib/ripper/lexer.rb | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/ext/ripper/lib/ripper/lexer.rb b/ext/ripper/lib/ripper/lexer.rb
index a2d4d655b5b..23db3a05708 100644
--- a/ext/ripper/lib/ripper/lexer.rb
+++ b/ext/ripper/lib/ripper/lexer.rb
@@ -62,6 +62,17 @@ class Ripper https://github.com/ruby/ruby/blob/trunk/ext/ripper/lib/ripper/lexer.rb#L62
         freeze
       end
 
+      def [](index)
+        case index
+        when 0
+          warn "Calling `Lexer::State#[0]` is deprecated, please use `Lexer::State#to_int` instead"
+          @to_int
+        when 1
+          warn "Calling `Lexer::State#[1]` is deprecated, please use `Lexer::State#to_s` instead"
+          @event
+        end
+      end
+
       alias to_i to_int
       alias inspect to_s
       def pretty_print(q) q.text(to_s) end
@@ -84,6 +95,26 @@ class Ripper https://github.com/ruby/ruby/blob/trunk/ext/ripper/lib/ripper/lexer.rb#L95
         @message = message
       end
 
+      def [](index)
+        case index
+        when 0
+          warn "Calling `Lexer::Elem#[0]` is deprecated, please use `Lexer::Elem#pos` instead"
+          @pos
+        when 1
+          warn "Calling `Lexer::Elem#[1]` is deprecated, please use `Lexer::Elem#event` instead"
+          @event
+        when 2
+          warn "Calling `Lexer::Elem#[2]` is deprecated, please use `Lexer::Elem#tok` instead"
+          @tok
+        when 3
+          warn "Calling `Lexer::Elem#[3]` is deprecated, please use `Lexer::Elem#state` instead"
+          @state
+        when 4
+          warn "Calling `Lexer::Elem#[4]` is deprecated, please use `Lexer::Elem#message` instead"
+          @message
+        end
+      end
+
       def inspect
         "#<#{self.class}: #{event}@#{pos[0]}:#{pos[1]}:#{state}: #{tok.inspect}#{": " if message}#{message}>"
       end
-- 
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