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Richard Smith
ce080b3549
When a class extends an interface, referring to a member name of the interface as an unqualified name should refer to the class's corresponding associated entity value, not to the associated entity itself. Similarly, in an `impl`, unqualified names of associated entities should refer to the `impl`'s corresponding value for that entity. To support this, we treat `impl`s as `extend`ing their implemented facet type, and we make lookups into an extended facet type use the `Self` type of the extending `impl` or `class` if lookup finds an associated entity. We already did the latter if the extending entity was an interface; this extends the existing support for these other cases.