///|
fn main {
  let source = "N10 G21 G90 (metric absolute)\nN20 G1 X10 Y5 F600 ; first pass"
  let document = @gcode.parse_gcode_document(source).unwrap()
  println(@gcode.render_block_structure(document))
  println(@gcode.render_program_index(@gcode.index_document(document)))
}