nimforum mirror - set up an array length at compile time

this doesn't work and gives this error: cannot evaluate at compile time: xlen

var
  xlen = 4
  ylen = 3
var a: array[1..xlen, array[1..ylen, int]]

this works:

var
  xlen = 4
  ylen = 3
var a: array[1..4, array[1..3, int]]

how can I set up a matrix array variables without using numbers directly ?

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