`auto it = logs_.begin(); it->IsSyncing()` had no type for `it`: a call
on a library container (`std::deque<LogWriterNumber>`) returned nothing
the auto-local reader could use, so `->` calls on it were matched by the
method's name. A standard or abseil container's `begin`/`end`/`find`/
`lower_bound`/`rbegin`/… now types as `<container>::iterator`, and a
standard search (`std::lower_bound`, `std::find_if`, `std::next`, …) as
the iterator it is given first; #2576's cppArrowTarget then reaches the
container's element.
The element is looked up where the container's type is written (the
`auto` local's declared site, a data member's class), not where the call
is: an element nested in another class (`vs->obsolete_files_.begin()`)
finds that class's type, not a namesake visible at the call. A holder's
type stays looked up at the call: from a pimpl member's header the lookup
finds a namesake (protobuf's other `DescriptorIndex`) or nothing.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Colby Mchenry