https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58091
S. Davis Herring <herring at lanl dot gov> changed:
What |Removed |Added
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CC| |herring at lanl dot gov
--- Comment #6 from S. Davis Herring <herring at lanl dot gov> ---
The lookup is ambiguous: generally a < forces ordinary lookup to take place,
even in contexts like declarator-ids where sometimes other possibilities apply
(like defining a hidden friend). (ADL can still rescue "f<0>(x)", but only
because nowadays there is a rule to form a template-id there if f isn't found
by lookup at all.) The language does not in general filter lookup
possibilities by which results would work in the syntactic context.