undefined method `as_name' in rubykoan - ruby

Question

I'm doing RubyKoan about_iteration part.
But, I encounter an error on the test_each_is_a_method_on_arrays test that I don't know how to solve ;
undefined method `as_name' for #<AboutIteration:0x00007fcbc6031dc8 #name=:test_each_is_a_method_on_arrays,
#failure=#<NoMethodError: undefined method `as_name' for #<AboutIteration:0x00007fcbc6031dc8 ...>>, #koan_cou
nt=17, #step_count=158, #koan_file="AboutIteration">
This is the code ;
require File.expand_path(File.dirname(__FILE__) + '/neo')
class AboutIteration < Neo::Koan
# -- An Aside ------------------------------------------------------
# Ruby 1.8 stores names as strings. Ruby 1.9 stores names as
# symbols. So we use a version dependent method "as_name" to convert
# to the right format in the koans. We will use "as_name" whenever
# comparing to lists of methods.
in_ruby_version("1.8") do
def as_name(name)
name.to_s
end
end
in_ruby_version("1.9", "2.0") do
def as_name(name)
name.to_sym
end
end
# Ok, now back to the Koans.
# -------------------------------------------------------------------
def test_each_is_a_method_on_arrays
assert_equal true, [].methods.include?(as_name(:each))
end
This is the full error ;
➜ koans git:(main) ✗ ruby path_to_enlightenment.rb
AboutIteration#test_each_is_a_method_on_arrays has damaged your karma.
The Master says:
You have not yet reached enlightenment.
Do not lose hope.
The answers you seek...
undefined method `as_name' for #<AboutIteration:0x00007fcbc6031dc8 #name=:test_each_is_a_method_on_arrays,
#failure=#<NoMethodError: undefined method `as_name' for #<AboutIteration:0x00007fcbc6031dc8 ...>>, #koan_cou
nt=17, #step_count=158, #koan_file="AboutIteration">
Please meditate on the following code:
/Users/amirulasyraf/Documents/koans/about_iteration.rb:27:in `test_each_is_a_method_on_arrays'
when you lose, don't lose the lesson
your path thus far [............................X_____________________] 157/278 (56%)

Answer 1

You are using a version of RubyKoans that is over seven years out-of-date and only supports Ruby 1.8, 1.9, and 2.0. The current version of RubyKoans supports Ruby up to 2.7 (but not 3.0).

Answer 2

#as_name is defined in the in_ruby_version block. Adding Ruby 3 to the list of versions did it for me.
in_ruby_version("1.9", "2", "3") do
def as_name(name)
name.to_sym
end
end