ruby pattern matching using refinements

pattern_match.rb

class MatchIt
  class Any
    def ===( other ) true end
  end

  I = Any.new
    
  module PatternMatch
    refine Array do
      def ===( other )
        instances = Array other
        each_with_index do |pattern,index|
          pattern === instances[index] or return false
        end
        true
      end
    end
  end

  using PatternMatch

  def match( arg1, arg2, arg3 )
    case [arg1, arg2, arg3]
    when [Enumerable, Enumerable] then :two_arrays
    when [I,String] then :thing_and_string
    when [Symbol, Symbol, Symbol] then :symbol_triple
    else raise NotImplementedError, "No match for #{[arg1, arg2, arg3].inspect}"
    end
  end
end

# MatchIt.new.match :one, :two, :tre
# => :symbol_triple

# MatchIt.new.match [1,2,3], [4,5,6], :other_thing
# => :two_arrays

# MatchIt.new.match Object.new, "Woohoo", Math::PI
# => :thing_and_string

# MatchIt.new.match Object.new, :woohoo, Math::PI
# => NotImplementedError: No match for [#<Object:0xb250840>, :woohoo, 3.141592653589793]