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

| h:
h!

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