a := [1,2,3,4,5,6,7,8] ----> list(8)
a1 := a[2:4] ----> list(2)
a2 := a[7:2] ----> list(5)
a3 := a[2+:3] ----> list(3)
a4 := a[-1-:3] ----> list(3)
a1[1] ----> 2
a2[1] ----> 2
a3[1] ----> 2
a4[1] ----> 5
a4[1] := a ----> list(8)
Run-time error 111 at line 19 in expr41.icn
variable expected
offending value: [1,2]