[cfe-dev] [Patch] AST support, and unqualified name lookup for using-directives

[Piotr Rak]

Hi,

Sorry, I have just noticed crash on valid code caused by this patch,
and not handling ambiguous name lookup results properly in
Sema::ActOnUsingDirective :(
Attached diff to previous, and also updated version, fixing this
crash, and extending tests.

Piotr
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