From 3eb1f1dd105a971d3c83741b02d4da68794b1652 Mon Sep 17 00:00:00 2001
From: Ryuta Kamizono <kamipo@gmail.com>
Date: Thu, 26 Dec 2019 18:30:11 +0900
Subject: [PATCH] Cannot parse `def self.use(...)` in Ruby 2.6

---
 actionpack/lib/action_controller/metal.rb | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/actionpack/lib/action_controller/metal.rb b/actionpack/lib/action_controller/metal.rb
index 85b558f8a2..ad093b73e7 100644
--- a/actionpack/lib/action_controller/metal.rb
+++ b/actionpack/lib/action_controller/metal.rb
@@ -218,16 +218,13 @@ module ActionController
       super
     end
 
-    # Pushes the given Rack middleware and its arguments to the bottom of the
-    # middleware stack.
-    if RUBY_VERSION >= "2.7"
-      def self.use(...)
-        middleware_stack.use(...)
-      end
-    else
-      def self.use(*args, &block)
+    class << self
+      # Pushes the given Rack middleware and its arguments to the bottom of the
+      # middleware stack.
+      def use(*args, &block)
         middleware_stack.use(*args, &block)
       end
+      ruby2_keywords(:use) if respond_to?(:ruby2_keywords, true)
     end
 
     # Alias for +middleware_stack+.