What logic is allowed inside an always_comb?

Is there a summary of the kind of logic that one can use inside an
@always_comb without confusing MyHDL's black parsing magic?

I attempted to do:

@always_comb
def dostuff():
    for i, o in ((i1, o1), (i2, o2)):
        o.next = i

but it didn't behave, and looking into the implementation of always_comb I
can see that the "for" loop is not compatible.  It decides that i1, o1, i2
and o2 are all inputs and that there are no outputs.

I had a look at the documentation but didn't see a summary anywhere of the
kind of logic that I'm allowed to use here.  Does such a summary exist?
It's quite possible that I just read over it.

Cheers,
Ben

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