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use std
const main = {
var n
n = 0
for (x, i) in std.byenum([1,3,5,7,9][:])
std.assert(x == n, "invalid enum idx {}", x)
std.assert(i == n*2 + 1, "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++
;;
n = 0
for x in std.byreverse([3, 2, 1, 0][:])
std.assert(x == n, "invalid reversed value {}, expected {}", x, n)
n++
;;
}
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