Although I don't find anything in the styleguide about this (which, btw, I don't think should be followed down to the letter, because it was written by only human programmers that like a certain style, in the end), if you want to make this case more visible, i'd go for opening a new block, and not pushing `else` to the new line:

    } else {
      pushUp(tree.up, worker)
    }