:@choice=1
:g = "g"!script($_)
	| a |>
		|-> a
		#p!checkpoint
		| aa |>
			|-> aa
		| ab |>
			|-> ab
	| b |>
		|-> b
	choice = 2
	|autoflush
	| c |>
		|-> c
	choice = 1

| g:
g!

| g from #p:
g!from(#p)