[cfe-dev] [PATCH] Default implementation for ExternalASTSource's pure virtual functions

[Axel Naumann]

Hi,

I'd suggest to provide default implementations for ExternalASTSource's
pure virtual functions. Derived classes should actually not be required
to implement them. See e.g. r126387 (offering an orthogonal lookup
source through ExternalASTSource::LookupUnqualified()), and lldb.

Attached patch does that (+ cleanup of forward declarations).

I think it's a semi-minor patch, so if there are no comments I'll commit
it in 24 hours :-)

Cheers, Axel.
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