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Colby Mchenry
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The resolver's name-existence pre-filter read no leading `::`: its `::` branch wanted the separator past the first character, and the single-`:` loop skips names holding `::`. So `::leveldb::RepairDB(…)`, `::ROCKSDB_NAMESPACE::RepairDB(…)` or protobuf's `::_pbi::…` calls were dropped before any strategy ran, unless a detected framework claimed them. protobuf's got through only because it ships three Swift files: the Swift ↔ Objective-C bridge claims any name with a `:` in it, which is why #2415 left claimsReference() universal. - The pre-filter checks a C or C++ name without its leading `::`. - claimsReference() is asked only of the frameworks that resolve the reference's language (frameworksFor), like resolve() since #2415. - matchByQualifiedName takes a global-qualified C/C++ name as exactly that qualified name. Its suffix match took a namesake nested in another namespace or class: with the pre-filter alone, 23 of the 24 edges it added on leveldb, fmt and rocksdb were wrong, mostly wrappers like fmt's mock `test::open` linked to the `::open(…)` they wrap, and protobuf's `::operator delete` went to `DynamicMessage::operator delete`. A declaration inside a namespace a macro opens (fmt's `struct pipe`) only looks global in the index, so it is skipped; step 5 still reads those. - `::std::…` and `::memset` count as `std::…` and `memset` for the built-in check, and step 5 returns early for a single-segment name. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>