https://git.ruby-lang.org/ruby.git/commit/?id=3685b5af95

From 3685b5af95fc31b99b34a5a4f75bdc7c0ba622f4 Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman+foo@g...>
Date: Sun, 7 Nov 2021 20:30:50 -0600
Subject: Only iterate Lexer heredoc arrays

The last element in the `@buf` may be either an array or an `Elem`. In the case it is an `Elem` we iterate over every element, when we do not need to. This check guards that case by ensuring that we only iterate over an array of elements.
---
 ext/ripper/lib/ripper/lexer.rb | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/ext/ripper/lib/ripper/lexer.rb b/ext/ripper/lib/ripper/lexer.rb
index 92ee4ef7df3..a2d4d655b5b 100644
--- a/ext/ripper/lib/ripper/lexer.rb
+++ b/ext/ripper/lib/ripper/lexer.rb
@@ -166,17 +166,19 @@ class Ripper https://github.com/ruby/ruby/blob/trunk/ext/ripper/lib/ripper/lexer.rb#L166
     def on_heredoc_dedent(v, w)
       ignored_sp = []
       heredoc = @buf.last
-      heredoc.each_with_index do |e, i|
-        if Elem === e and e.event == :on_tstring_content and e.pos[1].zero?
-          tok = e.tok.dup if w > 0 and /\A\s/ =~ e.tok
-          if (n = dedent_string(e.tok, w)) > 0
-            if e.tok.empty?
-              e.tok = tok[0, n]
-              e.event = :on_ignored_sp
-              next
+      if Array === heredoc
+        heredoc.each_with_index do |e, i|
+          if Elem === e and e.event == :on_tstring_content and e.pos[1].zero?
+            tok = e.tok.dup if w > 0 and /\A\s/ =~ e.tok
+            if (n = dedent_string(e.tok, w)) > 0
+              if e.tok.empty?
+                e.tok = tok[0, n]
+                e.event = :on_ignored_sp
+                next
+              end
+              ignored_sp << [i, Elem.new(e.pos.dup, :on_ignored_sp, tok[0, n], e.state)]
+              e.pos[1] += n
             end
-            ignored_sp << [i, Elem.new(e.pos.dup, :on_ignored_sp, tok[0, n], e.state)]
-            e.pos[1] += n
           end
         end
       end
-- 
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