destructure rover in function param list

src/main.rs

@@ -8,12 +8,9 @@ mod rover {
 
     type Rover = (i32, i32, Facing);
 
-    pub fn forward(r : Rover) -> Rover {
+    pub fn forward((lon, lat, direction) : Rover) -> Rover {
-	match r {
-	    (lon, lat, direction) =>
 	(lon as i32, lat - 1 as i32, direction)
     }
-    }
 }
 
 #[cfg(test)]