From 89a4fd67453b33b7c709c715f01cfeff8efb2f9d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 4 Sep 2023 23:50:10 +0900
Subject: [PATCH] [ruby/yarp] Switch `ERB.new` at startup

https://github.com/ruby/yarp/commit/b87b4450cc
---
 yarp/templates/template.rb | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/yarp/templates/template.rb b/yarp/templates/template.rb
index c661dd04e7..5880f11957 100755
--- a/yarp/templates/template.rb
+++ b/yarp/templates/template.rb
@@ -266,7 +266,6 @@ module YARP
       template = File.expand_path("../#{filepath}", __dir__)
 
       erb = read_template(template)
-      erb.filename = template
 
       non_ruby_heading = <<~HEADING
       /******************************************************************************/
@@ -305,9 +304,17 @@ module YARP
 
     def read_template(filepath)
       template = File.read(filepath, encoding: Encoding::UTF_8)
-      if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
+      erb = erb(template)
+      erb.filename = filepath
+      erb
+    end
+
+    if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
+      def erb(template)
         ERB.new(template, trim_mode: "-")
-      else
+      end
+    else
+      def erb
         ERB.new(template, nil, "-")
       end
     end