https://git.ruby-lang.org/ruby.git/commit/?id=f120e65200

From f120e6520063913229a659741d96187eb2f7dd82 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 23 Jul 2020 01:08:06 +0900
Subject: [ruby/optparse] Define OptionParser::Version

https://github.com/ruby/optparse/commit/4c0021b5b2

diff --git a/lib/optparse.rb b/lib/optparse.rb
index 614ebc3..82582f6 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -419,6 +419,8 @@ https://github.com/ruby/ruby/blob/trunk/lib/optparse.rb#L419
 # have any questions, file a ticket at http://bugs.ruby-lang.org.
 #
 class OptionParser
+  OptionParser::Version = "0.1.0"
+
   # :stopdoc:
   NoArgument = [NO_ARGUMENT = :NONE, nil].freeze
   RequiredArgument = [REQUIRED_ARGUMENT = :REQUIRED, true].freeze
diff --git a/lib/optparse/optparse.gemspec b/lib/optparse/optparse.gemspec
index 2ec715c..d67060a 100644
--- a/lib/optparse/optparse.gemspec
+++ b/lib/optparse/optparse.gemspec
@@ -1,6 +1,14 @@ https://github.com/ruby/ruby/blob/trunk/lib/optparse/optparse.gemspec#L1
+name = File.basename(__FILE__, ".gemspec")
+version = nil
+["lib", ".."].find do |dir|
+  version = File.foreach(File.join(__dir__, dir, "#{name}.rb")) do |line|
+    /^\s*OptionParser::Version\s*=\s*"(.*)"/ =~ line and break $1
+  end rescue nil
+end
+
 Gem::Specification.new do |spec|
-  spec.name          = "optparse"
-  spec.version       = "0.1.0"
+  spec.name          = name
+  spec.version       = version
   spec.authors       = ["Nobu Nakada"]
   spec.email         = ["nobu@r..."]
 
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