I have a macro that wraps a function call in some debugging information.  I
would like to discard the results of the function call so that they don't
end up printed.  This usually works:

  (void (func))

...but it fails if func uses (values) to return multiple values, since void
is variadic but not multiple-return tolerant.  I have solved the problem
with (the equivalent of) wrapping it in a thunk:  ((thunk (func) (void))
but that's clumsy.

This is a specific example of the more general question "how could I
capture the result of a function call without knowing how many values will
come back or if it's normal return / multiple return?"

I've been through the docs on multiple return and I don't see a way to
handle this.  Is there one?

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