deconstruct_enum_class.rb

class Either
  def self.deconstruct_keys(*)
    { Right: Right, Left: Left }
  end
  
  class Right < Struct.new(:value); end
  class Left < Struct.new(:value);  end
end

Either => { Right:, Left: }
# Current:
#
# SyntaxError ((irb):62: key must be valid as local variables)
# Either in { Right:, Left: }
#             ^~~~~~

# Proposed:
[Right, Left]
# => [Either::Right, Either::Left]