https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110349
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Yeah, we don't want to give errors in lookup_name, pretty much for the reasons
you found.  cp_parser_lookup_name gives an ambiguity error when lookup_name
returns a TREE_LIST, so I think it makes sense to represent the case of
multiple _ declarations as a TREE_LIST rather than OVERLOAD.  Then I think you
don't need PLACEHOLDER_AMBIGUOUS_BINDING_P because you can see that from the
binding being a TREE_LIST.

I think find_last_decl should return nothing for a name-independent decl, and
give up on a TREE_LIST.

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