Fix for older set versions

`Set::VERSION` was not defined in old set.rb bundled with ruby 3.2 or
earlier.
Also add comment for spec/mspec/tool/remove_old_guards.rb.

1 files changed, 2 insertions, 1 deletions

diff --git a/spec/ruby/library/set/subset_spec.rb b/spec/ruby/library/set/subset_spec.rb
index a000f500ba..85666d633f 100644
--- a/spec/ruby/library/set/subset_spec.rb
+++ b/spec/ruby/library/set/subset_spec.rb
@@ -1,6 +1,7 @@
 require_relative '../../spec_helper'
 require_relative 'fixtures/set_like'
 require 'set'
+set_version = defined?(Set::VERSION) ? Set::VERSION : '1.0.0'
 
 describe "Set#subset?" do
   before :each do
@@ -33,7 +34,7 @@ describe "Set#subset?" do
     -> { Set[].subset?(Object.new) }.should raise_error(ArgumentError)
   end
 
-  version_is(Set::VERSION, ""..."1.1.0") do
+  version_is(set_version, ""..."1.1.0") do #ruby_version_is ""..."3.3" do
     context "when comparing to a Set-like object" do
       it "returns true if passed a Set-like object that self is a subset of" do
         Set[1, 2, 3].subset?(SetSpecs::SetLike.new([1, 2, 3, 4])).should be_true