From d32e2bb02d15008da008057fbd6b541662d52588 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 24 May 2020 20:12:32 +0900
Subject: [PATCH] Allow references to $$ in Ripper DSL

---
 ext/ripper/tools/dsl.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/ripper/tools/dsl.rb b/ext/ripper/tools/dsl.rb
index d2b9715a71..49ff51711f 100644
--- a/ext/ripper/tools/dsl.rb
+++ b/ext/ripper/tools/dsl.rb
@@ -7,6 +7,9 @@
 #   v2 = dispatch0(void_stmt);
 #   $$ = dispatch2(stmts_add, v1, v2);
 
+$dollar = "$$"
+alias $$ $dollar
+
 class DSL
   def initialize(code, options)
     @events = {}