on rightclick:
    block is a sign
    line 2 of clicked block is "checkpoint"
    line 3 of clicked block is "[rightclick]"
    cp {set.%player%} to location of player
    message "<gold>checkpoint saved!!"
    command "/playsound note.pling %player% ~ ~ ~ 1 2 1"
on rightclick:
    if player is holding a diamond:
    cp {go.%player%} to location of player