type GameState = object
    s_w,  s_h: int
    rend_back: array[0..s_w-1, array[0..s_h-1, int]]
    rend_fore: array[0..s_w-1, array[0..s_h-1, int]]
    parse_input: proc()
    render: proc()
    run: proc()

test1.nim(27, 24) Error: undeclared identifier: 's_w'