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c871343ac2
This change allows a #[namespace (namespace = A::B)] attribute for each item in a cxx::bridge. We now have a fair number of different types of name floating around: * C++ identifiers * C++ fully-qualified names * Rust identifiers * Rust fully-qualified names (future, when we support sub-modules) * Items with both a Rust and C++ name (a 'Pair') * Types with only a known Rust name, which can be resolved to a C++ name. This change attempts to put some sensible names for all these things in syntax/mod.rs, and so that would be a good place to start review. At the moment, the Namespace (included in each CppName) is ruthlessly cloned all over the place. As a given namespace is likely to be applicable to many types and functions, it may save significant memory in future to use Rc<> here. But let's not optimise too early.