https://git.ruby-lang.org/ruby.git/commit/?id=e666bd1c5a

From e666bd1c5a595ab64faee00b3744b3bfa591acb1 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Fri, 4 Dec 2020 19:36:30 +0900
Subject: Skip subclass spec with SortedSet


diff --git a/spec/ruby/library/set/enumerable/to_set_spec.rb b/spec/ruby/library/set/enumerable/to_set_spec.rb
index 0f5504f..3790d8d 100644
--- a/spec/ruby/library/set/enumerable/to_set_spec.rb
+++ b/spec/ruby/library/set/enumerable/to_set_spec.rb
@@ -7,10 +7,12 @@ describe "Enumerable#to_set" do https://github.com/ruby/ruby/blob/trunk/spec/ruby/library/set/enumerable/to_set_spec.rb#L7
     {a: 1, b: 2}.to_set.should == Set[[:b, 2], [:a, 1]]
   end
 
-  it "allows passing an alternate class for Set" do
-    sorted_set = [1, 2, 3].to_set(SortedSet)
-    sorted_set.should == SortedSet[1, 2, 3]
-    sorted_set.instance_of?(SortedSet).should == true
+  ruby_version_is ''...'3.0' do
+    it "allows passing an alternate class for Set" do
+      sorted_set = [1, 2, 3].to_set(SortedSet)
+      sorted_set.should == SortedSet[1, 2, 3]
+      sorted_set.instance_of?(SortedSet).should == true
+    end
   end
 
   it "passes down passed blocks" do
-- 
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