[cfe-users] Getting underlying type for `using typename` declaration

[Victor “LOST” Milovanov via cfe-users]

Hi CFE users!

I am trying to get a `QualType` instance from `UnresolvedUsingTypenameDecl`. Unlike `TypeAliasDecl` `UnresolvedUsingTypenameDecl` does not have a `getUnderlyingType` method.

I could not find a way to construct one from the `DeclarationNameInfo` (`getNameInfo`) and `NestedNameSpecifier` (`getQualifier`).

The library I am working on already supports type aliases, and I was hoping I could treat `using typename` declarations in a similar way. Not sure if it is the right way though.

Regards,
Victor
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