Two ASDF questions and a possible micro-bug

Hi.  I have been trying to understand all about asdf, and I have two
questions:

What is the :weakly-depends-on feature intended to be for?

Is there ever a case where a component has no input files?  The code
has a conditional that checks for this, but it's hard to see how it
could ever arise, and perhaps it should signal an exception.

I think I have also spotted a possible bug:

The comments at fwd-or-return-t say that if the file has been deleted,
we could keep going after the warning.  But fwd-or-return-t would
return t, which would then be given as an argument to "max", which
expects to see only numbers.

Thank you!

-- Dan



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