import strutils

proc test[T](val: seq[T]) =
    echo "Sequence type $#..$#" % [$val.high, $val.low]
proc test[T](val: T) =
    echo "Primitive type $# bytes" % [$val.sizeof]
proc test[T](val:openarray[T]) =
    echo "Array type $#..$#" % [$val.high, $val.low]

var a: int = 4
var b: seq[int] = @[0,1,2,3,4,5,6,7]
var c: array[0..10, int]

when isMainModule:
    echo "A"
    test(a)
    echo "B"
    test(b)
    echo "C"
    test(c) # "Primitive type 88 bytes"