Switch EvalLookupSingleImplWitness
from "concrete" to "final" terminology
#6246
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A
final impl
can have a symbolic witness, but that witness is still final. Using "final" here per discussion on #generics-and-templates.I'm also changing the variant a little because
concrete_witness
was only called whenhas_concrete_value
was true, so it can be more careful about its contract. Having a more explicitNone
also simplifieshas_value
. I think it doesn't change the overall cost much past that.