:post run = "check"

:x = [99]

:l = [1,x]

:n = 0

:$ f(t)
	~ t!insert(len(l)+1)

	f1: {l} {t}

	CHECK
	:! c

	~ n < 1
		REC

		~ n += 1
		~ f(t)

		END REC

	f2: {l}

	CHECK 2
	:! d

	~ t!insert(len(t)+1)

	~ t(2)!insert(len(l)+1)

	~ error("t")

	f3: {l} {t}

~ f(l)

FINAL

l: {l}

x: {x}

:$ check
	AFTER ERROR

	l: {l}