Errors are passed through "properly"

card_stuffs/src/lib.rs

@@ -114,22 +114,22 @@ pub enum StackingError {
     #[error("Trying to stack the same coloured suit")]
     SameColour,
     #[error("{0} is not \"next\" to {1}")]
-    NotAdjacent(Card, Card),
+    NotAdjacent(String, String),
 }
 
 impl Card {
-    pub fn can_be_placed_on_top(&self, top: Card) -> bool {
+    pub fn can_be_placed_on_top(&self, top: Card) -> Result<(), StackingError> {
         // Can't be the same Colour
         if self.suit.colour() != top.suit.colour() {
-            return false
+            return Err(StackingError::SameColour);
         }
 
         // Needs to be adjascent
         if self.value == Value::King || self.value.indexed_values() != top.value.indexed_values() + 1 {
-            return false
+            return Err(StackingError::NotAdjacent(self.to_string(), top.to_string()));
         }
 
-        true
+        Ok(())
     }
 }