https://git.ruby-lang.org/ruby.git/commit/?id=1d435bd51a

From 1d435bd51aeca75f6e437bc92de2271a716a1ced Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 19 Oct 2019 15:57:25 +0900
Subject: Extend Ripper DSL to set to pseudo variables other than `$$`


diff --git a/ext/ripper/tools/dsl.rb b/ext/ripper/tools/dsl.rb
index 34b435e..925c09b 100644
--- a/ext/ripper/tools/dsl.rb
+++ b/ext/ripper/tools/dsl.rb
@@ -12,7 +12,11 @@ class DSL https://github.com/ruby/ruby/blob/trunk/ext/ripper/tools/dsl.rb#L12
     @events = {}
     @error = options.include?("error")
     @brace = options.include?("brace")
-    @final = options.include?("final")
+    if options.include?("final")
+      @final = "p->result"
+    else
+      @final = (options.grep(/\A\$[$\d]\z/)[0] || "$$")
+    end
     @vars = 0
 
     # create $1 == "$1", $2 == "$2", ...
@@ -37,9 +41,7 @@ class DSL https://github.com/ruby/ruby/blob/trunk/ext/ripper/tools/dsl.rb#L41
   undef class
 
   def generate
-    s = "$$"
-    s = "p->result" if @final
-    s = "#@code#{ s }=#@last_value;"
+    s = "#@code#@final=#@last_value;"
     s = "{VALUE #{ (1..@vars).map {|v| "v#{ v }" }.join(",") };#{ s }}" if @vars > 0
     s << "ripper_error(p);" if @error
     s = "{#{ s }}" if @brace
-- 
cgit v0.10.2


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