Made use of the max turns thing

Unsure I'll ever use it... eh

card_stuffs/src/lib.rs

@@ -189,7 +189,7 @@ impl Deck {
 }
 
 #[derive(Debug, Copy, Clone)]
-enum NumPassesThroughDeck {
+pub enum NumPassesThroughDeck {
     Unlimited,
     Limited(u64),
 }
@@ -202,7 +202,7 @@ pub struct Klondike {
     pub deck: Vec<Card>, // this term is a bit overloaded
     pub waste: Vec<Card>,
     pub foundation: [Vec<Card>; 4], // 4 = len of num suits
-    _max_num_passes_through_deck: NumPassesThroughDeck,
+    max_num_passes_through_deck: NumPassesThroughDeck,
     pub current_num_passes_through_deck: u64,
     pub num_cards_turned: u8,
 }
@@ -217,7 +217,15 @@ impl Klondike {
             }
         }
     }
+    // TODO return some sort of error
     pub fn waste_to_deck(self: &mut Self) {
+        match self.max_num_passes_through_deck {
+            NumPassesThroughDeck::Unlimited => (),
+            NumPassesThroughDeck::Limited(n) => if n >= self.current_num_passes_through_deck {
+                // no!
+                return
+            },
+        }
         if self.deck.len() != 0 {
             // no!
         } else {
@@ -247,7 +255,7 @@ impl Default for Klondike {
             deck: deck.cards,
             waste: Vec::new(),
             foundation: [Vec::new(), Vec::new(), Vec::new(), Vec::new()], // is this really the best way?
-            _max_num_passes_through_deck: NumPassesThroughDeck::Unlimited,
+            max_num_passes_through_deck: NumPassesThroughDeck::Unlimited,
             current_num_passes_through_deck: 0,
             num_cards_turned: 3,
         }