use i64 to avoid overflow

card_game/src/lib.rs

@@ -405,6 +405,7 @@ where
 	pub fn is_winnable(&self) -> Option<Vec<StateSnapshot<G>>> {
 		let mut state_moves = std::collections::HashMap::new();
 		let mut state = self.clone();
+		let mut i: u64 = 0;
 		while !state.is_win() {
 			// Continue existing iterator if it exists
 			let it = state_moves