https://git.ruby-lang.org/ruby.git/commit/?id=265b5382b2

From 265b5382b21db28e52d0314ef47025f881dcbf0f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 26 Nov 2019 14:00:08 +0900
Subject: Allow `$10` and more in the Ripper DSL


diff --git a/ext/ripper/tools/dsl.rb b/ext/ripper/tools/dsl.rb
index 27ba87f..d2b9715 100644
--- a/ext/ripper/tools/dsl.rb
+++ b/ext/ripper/tools/dsl.rb
@@ -15,17 +15,14 @@ class DSL https://github.com/ruby/ruby/blob/trunk/ext/ripper/tools/dsl.rb#L15
     if options.include?("final")
       @final = "p->result"
     else
-      @final = (options.grep(/\A\$[$\d]\z/)[0] || "$$")
+      @final = (options.grep(/\A\$(?:\$|\d+)\z/)[0] || "$$")
     end
     @vars = 0
 
     # create $1 == "$1", $2 == "$2", ...
-    re, s = "", ""
-    1.upto(9) do |n|
-      re << "(..)"
-      s << "$#{ n }"
-    end
-    /#{ re }/ =~ s
+    s = (1..20).map {|n| "$#{n}"}
+    re = Array.new(s.size, "([^\0]+)")
+    /#{re.join("\0")}/ =~ s.join("\0")
 
     # struct parser_params *p
     p = p = "p"
-- 
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