[kevincox]

rust-analyzer has this as well. I've never actually used it though. In most cases where I would have found it useful the function was so simple that I just did it manually without thinking. This also seems to do a better job cleaning up the resulting code than rust-analyzer does for example.

    let cell = self.cell_mut(pos);

Becomes:

    let cell = {
      let ref mut this = self;
      &mut this.board[usize::from(pos)]
    };

Instead of:

    let cell = &mut self.board[usize::from(pos)];

It did manage to simplify the argument (maybe because it was the same name?) but had to rename `self`.