proc main =
var a = @[1, 2, 3, 4]
var b: seq[int]
shallowCopy b, a
echo len(b)
add a, 1
echo len(a)
echo len(b)
main()
cHJvYyBtYWluID0KICB2YXIgYSA9IEBbMSwgMiwgMywgNF0KICB2YXIgYjogc2VxW2ludF0KICAgIAogIHNoYWxsb3dDb3B5IGIsIGEKICAKICBlY2hvIGxlbihiKQogIGFkZCBhLCAxCiAgCiAgZWNobyBsZW4oYSkKICBlY2hvIGxlbihiKQogIAptYWluKCk=