Using `Move::Put` results in an illegal move

[davebrent]

The following snippet fails when I think it should pass

let pos = Chess::default();
assert!(pos.is_legal(&Move::Put {
    role: Role::Pawn,
    to: Square::D4
}));

In the method, the move list does contain the valid move, but it has constructed a type of Move::Normal so the .contains(m) fails when using Move::Put

fn is_legal(&self, m: &Move) -> bool {
    ...
    moves.contains(m)
}

[niklasf]

Move::Put refers to the chess variant Crazyhouse, where players can take a captured piece out of their pocket and put it on the board.

I was going to link the documentation, but it is nowhere clearly stated. Will fix.