https://git.ruby-lang.org/ruby.git/commit/?id=4ccc66265c

From 4ccc66265cdef0480eb6ff46f6be9f8de1a01891 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Tue, 3 Nov 2020 07:14:36 +0900
Subject: Added help message for gem i webrick in gem server command


diff --git a/lib/rubygems/server.rb b/lib/rubygems/server.rb
index a9529f7..61ea78b 100644
--- a/lib/rubygems/server.rb
+++ b/lib/rubygems/server.rb
@@ -1,5 +1,4 @@ https://github.com/ruby/ruby/blob/trunk/lib/rubygems/server.rb#L1
 # frozen_string_literal: true
-require 'webrick'
 require 'zlib'
 require 'erb'
 require 'uri'
@@ -424,6 +423,13 @@ div.method-source-code pre { color: #ffdead; overflow: hidden; } https://github.com/ruby/ruby/blob/trunk/lib/rubygems/server.rb#L423
   ERB
 
   def self.run(options)
+    begin
+      require 'webrick'
+    rescue LoadError
+      puts "webrick is not found. You may need to `gem install webrick` to install webrick."
+      exit
+    end
+
     new(options[:gemdir], options[:port], options[:daemon],
         options[:launch], options[:addresses]).run
   end
-- 
cgit v0.10.2


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