https://git.ruby-lang.org/ruby.git/commit/?id=d2d42081ce

From d2d42081ce76954ff55392a6e07e3eb4f26c696c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 11 Dec 2019 16:19:49 +0900
Subject: `Thread#to_s` has been added at ruby 2.5


diff --git a/spec/ruby/core/thread/shared/to_s.rb b/spec/ruby/core/thread/shared/to_s.rb
index 7bc7234..0c4e3c0 100644
--- a/spec/ruby/core/thread/shared/to_s.rb
+++ b/spec/ruby/core/thread/shared/to_s.rb
@@ -1,15 +1,9 @@ https://github.com/ruby/ruby/blob/trunk/spec/ruby/core/thread/shared/to_s.rb#L1
 require_relative '../fixtures/classes'
 
 describe :thread_to_s, shared: true do
-  sep = " "
-  ruby_version_is(''..."2.7"){ sep = '@' }
+  sep = ruby_version_is("2.7") ? " " : "@"
 
   it "returns a description including file and line number" do
-    ruby_version_is(''...'2.5') do
-      # Thread#to_s is not same as Thread#inspect until Ruby 2.4.
-      skip if @method == :to_s
-    end
-
     Thread.new { "hello" }.send(@method).should =~ /^#<Thread:([^ ]*?)#{sep}#{Regexp.escape __FILE__}:#{__LINE__ } \w+>$/
   end
 
diff --git a/spec/ruby/core/thread/to_s_spec.rb b/spec/ruby/core/thread/to_s_spec.rb
index cb182a0..942d271 100644
--- a/spec/ruby/core/thread/to_s_spec.rb
+++ b/spec/ruby/core/thread/to_s_spec.rb
@@ -2,5 +2,7 @@ require_relative '../../spec_helper' https://github.com/ruby/ruby/blob/trunk/spec/ruby/core/thread/to_s_spec.rb#L2
 require_relative 'shared/to_s'
 
 describe "Thread#to_s" do
-  it_behaves_like :thread_to_s, :to_s
+  ruby_version_is "2.5" do
+    it_behaves_like :thread_to_s, :to_s
+  end
 end
-- 
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