error for room type

src/game.rs

@@ -33,12 +33,15 @@ impl RoomFormat {
 #[derive(Debug, Eq, PartialEq, Copy, Clone)]
 pub enum RoomType {Room, Set}
 
-impl From<&str> for RoomType {
-    fn from(string: &str) -> RoomType {
+#[derive(Debug)]
+pub struct InvalidRoomType;
+
+impl RoomType {
+    fn from(string: &str) -> Result<RoomType, InvalidRoomType> {
         match string {
-            "ROOM" => RoomType::Room,
-            "SET"  => RoomType::Set,
-            _ => panic!("Unrecognised room type"),
+            "ROOM" => Ok(RoomType::Room),
+            "SET"  => Ok(RoomType::Set),
+            _ => Err(InvalidRoomType),
         }
     }
 }