array indexing, nested array literals

examples/arrays.zr

@@ -1,10 +1,5 @@
 func main[] : I64
-    let xs: Array = [5849, 3869, 2859]
-    Array.push(xs, 5242)
-    Array.push(xs, 6533)
-    Array.push(xs, 4574)
-
-    for i in 0..Array.size(xs)
-        xs
-        |> Array.nth(i)
-        |> print_i64()
+    let xs: Array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+    for x in 0..3
+        for y in 0..3
+            print_i64(xs[y][x])