> Of course the above can be worked around by running ‘compile-file’ in a
> child process, but forking alone is more expensive than ‘compile-file’,
> so that’s not really a solution when there are many files.

As it turns out, the hack above is just as slow as forking: what takes
time is not forking, but reloading the same modules over and over again.

So we should have a way to keep modules that have been fully evaluated,
and to discard modules that have not.

Ideas welcome.

Ludo’.