destructure rover in function param list

src/main.rs

@@ -8,11 +8,8 @@ mod rover {
 
     type Rover = (i32, i32, Facing);
 
-    pub fn forward(r : Rover) -> Rover {
-	match r {
-	    (lon, lat, direction) =>
-		(lon as i32, lat - 1 as i32, direction)
-	}
+    pub fn forward((lon, lat, direction) : Rover) -> Rover {
+	(lon as i32, lat - 1 as i32, direction)
     }
 }