rjmccall added a comment. As a more general comment, I believe the rule is that we try to always make a MemberExpr/UnresolvedMemberExpr whenever there *might* be a base, but that the resulting distinction between an implicit-base UnresolvedMemberExpr and an UnresolvedLookupExpr is not actually used for anything in Sema. When I wrote this code originally, I wanted to make sure we made the "right" decision early to leave plenty of room to handle language requirements that drove a stronger wedge between them, and that's probably still a good idea; but I'm pretty sure it's true that those requirements don't exist right now. It does give you an invariant that you only see implicit-base MemberExprs and UnresolvedMemberExprs in contexts that actually have a 'this'.
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