[cfe-dev] How to get the namespace name from a clang::CXXRecordDecl?

[Yafei Liu via cfe-dev]

I'm using an AST matcher to get some `clang::CXXRecordDecl`s, and now I
want to get the namespace of that record, but I searched all the apis and
cannot find one.

P.S. I dumped the record and found that there's no information about
namespaces, does that mean I have to handle finding namespaces as well? If
that's the case, an AST matcher seems not very helpful since I have to go
through the source code anyway.
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