[ruby/benchmark] Don't use version.rb

https://github.com/ruby/benchmark/commit/6d51b10500

lib/benchmark.rb

@@ -121,6 +121,8 @@
 
 module Benchmark
 
+  VERSION = "0.2.1"
+
   BENCHMARK_VERSION = "2002-04-25" # :nodoc:
 
   # Invokes the block with a Benchmark::Report object, which

lib/benchmark/benchmark.gemspec

@@ -1,12 +1,13 @@
-begin
-  require_relative "lib/benchmark/version"
-rescue LoadError # Fallback to load version file in ruby core repository
-  require_relative "version"
+name = File.basename(__FILE__, ".gemspec")
+version = ["lib", Array.new(name.count("-")+1, ".").join("/")].find do |dir|
+  break File.foreach(File.join(__dir__, dir, "#{name.tr('-', '/')}.rb")) do |line|
+    /^\s*VERSION\s*=\s*"(.*)"/ =~ line and break $1
+  end rescue nil
 end
 
 Gem::Specification.new do |spec|
-  spec.name          = "benchmark"
-  spec.version       = Benchmark::VERSION
+  spec.name          = name
+  spec.version       = version
   spec.authors       = ["Yukihiro Matsumoto"]
   spec.email         = ["matz@ruby-lang.org"]
 

lib/benchmark/version.rb

@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-module Benchmark
-  VERSION = "0.2.1"
-end