[cfe-commits] [PATCH] Implement C++11 alias declarations

[Richard Smith]

Hi,

The attached patch implements C++11's (non-template) alias declarations:

  using A = int;

The approach I've taken is to add two new classes to the Decl hierarchy:
TypedefNameDecl and TypeAliasDecl. TypedefNameDecl is a base class for
TypedefDecl and TypeAliasDecl; most code which previously operated on
TypedefDecl's should now use TypedefNameDecl. TypedefType is unchanged,
except that it now refers to a TypedefNameDecl rather than a TypedefDecl.

Please review!

Thanks,
Richard
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