sbenza added a comment.

In http://reviews.llvm.org/D19871#419985, @aaron.ballman wrote:

> In http://reviews.llvm.org/D19871#419954, @etienneb wrote:
>
> > In http://reviews.llvm.org/D19871#419947, @aaron.ballman wrote:
> >
> > > Is this required for some purpose?
> >
> >
> > It's used in clang-tidy checkers.
> >
> >   see http://reviews.llvm.org/D19841
>
>
> It's good to have that context in a review for functionality that isn't part 
> of the proposed patch. :-) Looking at the other patch, I would prefer to keep 
> this matcher narrowed to just clang-tidy unless you can also solve how to 
> expose it via the dynamic registry so that it can be used by tools like 
> clang-query.


What we have done in the past with enum-arg matchers is to use string->enum 
conversion in the dynamic bindings.
See the specialization `ArgTypeTraits<attr::Kind>` in `Marshallers.h`.
We could add one for `CastKind` too.


http://reviews.llvm.org/D19871



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