Fancy<->Ruby interop

fib.fy

class Integer {
  def fib {
    match self {
      case @{ < 2 } -> self
      case _ -> self - 1 fib + (self - 2 fib)
    }
  }
}

print_fib.rb

0.upto(10) do |i|
  # call into ruby via .fy method and pass along fancy message name
  puts i.fy(:fib)
end