Cannot create a type referencing a local constant

[alaviss]

import cps

proc foo() {.cps: Continuation.} =
  const X = 10
  var x: array[X, int]

got:

test.nim(3, 14) template/generic instantiation of `cps` from here
test.nim(5, 16) Error: undeclared identifier: 'X'

The problem is that Nim did not inline X into array[X, int], which is carried over to the environment definition, where X doesn't exist.