@ -> ^, functional example

examples/functional.zr

@@ -0,0 +1,11 @@
+func square[x: i64] : i64
+    return x * x
+
+func sum[a: i64, b: i64] : i64
+    return a + b
+
+func main[] : i64
+    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
+    |> alg.map(^square)
+    |> alg.reduce(^sum, 0)
+    |> io.println_i64()