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Jon Ross-Perkins
b1f734e1cd
A `final impl` can have a symbolic witness, but that witness is still final. Using "final" here per discussion on [#generics-and-templates](https://discord.com/channels/655572317891461132/941071822756143115/1428851511672312120). I'm also changing the variant a little because `concrete_witness` was only called when `has_concrete_value` was true, so it can be more careful about its contract. Having a more explicit `None` also simplifies `has_value`. I think it doesn't change the overall cost much past that.