Compiler issue with non-existent NIL conditions

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12

If I implement Range#each like this it works:

  def each : Nil
    {% if B == Nil %}
      {% raise "Can't each beginless range" %}
    {% end %}

    current = @begin
    if current.nil?
      raise ArgumentError.new("Can't each beginless range")
    end

    yield current

    {% if E == Nil %}
      while true
        {{ "yield current" }}
        current = current.succ
      end
    {% else %}
      end_value = @end

      while end_value.nil? || current < end_value
        {{ "yield current" }}
        current = current.succ
      end
    {% end %}
  end

But I had to interpolate inside macro, otherwise it complains about abstract stuff, I don’t know why.