Make from_fen return Result<Board, FenError>

src/game.rs

@@ -2,6 +2,7 @@ use crate::{
     board::{Board, Color},
     fen::from_fen,
 };
+use String as FenError;
 
 #[derive(Debug, PartialEq)]
 pub struct Game {
@@ -17,7 +18,7 @@ impl Game {
         }
     }
 
-    pub fn new_from_fen(fen: &str) -> Game {
+    pub fn new_from_fen(fen: &str) -> Result<Game, FenError> {
         from_fen(fen)
     }
 
@@ -75,7 +76,7 @@ impl fmt::Display for State {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         writeln!(f,
             "side_to_move: {:?}\ncastling_ability: {:b}\nen_passant_target_square: {:b}\nhalfmove_clock: {}\nfullmove_counter: {}\n",
-            self.side_to_move, self.castling_ability, 1u64 << self.en_passant_target_square, self.halfmove_clock, self.fullmove_counter)
+            self.side_to_move, self.castling_ability, 1_u64 << self.en_passant_target_square, self.halfmove_clock, self.fullmove_counter)
     }
 }