ref: abadb828b42e44dd0e50be143745a0c15d8c6c83
dir: /lib/std/test/iterutil.myr/
use std
const main = {
var n
n = 0
for (x, i) in std.byenum([0,2,4,6,8][:])
std.assert(x == n, "invalid enum idx {}", x)
std.assert(i == n*2, "invalid enum val {}", i)
n++
;;
n = 0
for (a, b) in std.byzip([0,2,4,6,8][:], [2,4][:])
std.assert(a == n*2, "invalid val from a: {}", a)
std.assert(b == n*2 + 2, "invalid val from b: {}", b)
n++
;;
}