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discard """
cmd: "nim check $options $file"
errormsg: "wrong number of variables"
"""
iterator xclusters*[T](a: openArray[T]; s: static[int]): array[s, T] {.inline.} =
var result: array[s, T] # iterators have no default result variable
var i = 0
while i < len(a):
for j, x in mpairs(result):
x = a[(i + j) mod len(a)]
yield result
inc(i)
proc m =
for (i, j, k) in xclusters([1, 2, 3, 4, 5], 3):
echo i, j, k
m()
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