impl From<&Zone> instead of the from_ref() method

src/world/zone.rs

@@ -28,31 +28,8 @@ pub struct Zone {
 	pub areas: HashSet<Id>,
 }
 
-impl Zone {
+impl From<&Zone> for Zone {
-	/// Create a new `Zone` from a `&Zone`.
+	fn from(zone: &Zone) -> Self {
-	///
-	/// # Arguments
-	///
-	/// * `zone: &Zone` : Reference to a `Zone`
-	///
-	/// # Examples
-	///
-	/// ```
-	/// use std::collections::HashSet;
-	/// use rude::id::Id;
-	/// use rude::world::Zone;
-	///
-	/// let zone = Zone {
-	///     id: Id::new(),
-	///     parent: Id::new(),
-	///     name: "Zone".into(),
-	///     users_visible: false,
-	///     areas: HashSet::new(),
-	/// };
-	///
-	/// assert_eq!(zone, Zone::from_ref(&zone));
-	/// ```
-	pub fn from_ref(zone: &Self) -> Self {
 		Self {
 			id: zone.id,
 			parent: zone.parent,