fn interp_number(n int) string {
	return '${n}'
}

fn interp_chain(prefix string, n int, suffix string) string {
	return '${prefix}${n}${suffix}'
}

fn interp_static(n int, suffix string) string {
	return 'n=${n}:${suffix}'
}

fn main() {
	assert interp_number(42) == '42'
	assert interp_chain('a', 7, 'b') == 'a7b'
	assert interp_static(9, 'z') == 'n=9:z'
}