[tankf33der]

Make this code compile and work under vgc cover:

import crypto.blake2s
import time

fn main() {
	a := []u8{len: 10_000_000, init: index}
	t1 := time.now()
	c := blake2s.sum256(a)
	println(time.since(t1))
	assert c.hex() == 'd3ebb0180aef5371235c43dd375466aaf5ec5b6f44c43dc8d2597e71c718f1fb'
}

v -cc gcc -gc vgc run blake2s.v