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opaque type proposal
I'm still worried about letting inheritance slip into the opaque type
proposal. It's not that I see any problem with Pavel's extension (I
don't), it's that I am worried that by deciding now on a semantics for
single inheritance we reduce our options if it ever becomes clear how
multiple inheritance should work. I confess I don't have a good example of
how it might get us in trouble, but the transition from single to multiple
inheritance is such a hot topic these days that I don't think any of us can
really be certain where it might take us.