The only reason why '&=' has a chance of getting into system.nim is that it
already exists for strings and right now it's just inconsistent. Apart from
that ``system.nim`` is already too bloated for my taste and of course everybody
wants to have his favourite pet feature in ``system.nim``.
What is not widely known however, is that you can have your own system.nim-like
modules via ``--import`` (of course you can put that into your config too).
