import "datetime"
import "iter"
import "math"

$now = datetime.now()

# alternate every four seconds
$mod0 = math.mod($now, 8) == 0
$mod1 = math.mod($now, 8) == 1
$mod2 = math.mod($now, 8) == 2
$mod3 = math.mod($now, 8) == 3
$mod = $mod0 || $mod1 || $mod2 || $mod3

$fn = func($x) { # notable because concrete type is fn(t1) t2, where t1 != t2
	len($x)
}

$in1 = if $mod {
	["a", "bb", "ccc", "dddd", "eeeee",]
} else {
	["ffffff", "ggggggg", "hhhhhhhh", "iiiiiiiii", "jjjjjjjjjj",]
}

$out1 = iter.map($in1, $fn)

$t1 = template("out1: {{ . }}", $out1)

test $t1 {}