samuel@aiko ~/P/i/bake (modernize-gem)> ruby --version
jruby 9.4.5.0 (3.1.4) 2023-11-02 1abae2700f OpenJDK 64-Bit Server VM 21.0.2+13 on 21.0.2+13 +jit [x86_64-linux]

samuel@aiko ~/P/i/bake (modernize-gem)> cat test.rb
class Thing
	attr :name
end

puts Thing.instance_method(:name)

samuel@aiko ~/P/i/bake (modernize-gem)> chruby jruby
samuel@aiko ~/P/i/bake (modernize-gem)> ruby test.rb
#<UnboundMethod: Thing#name(@name)()>
samuel@aiko ~/P/i/bake (modernize-gem)> chruby 3.3
samuel@aiko ~/P/i/bake (modernize-gem)> ruby test.rb
#<UnboundMethod: Thing#name() test.rb:2>