[llvm] r210920 - Finishing touch for the std::error_code transition.

[Chandler Carruth]

On Fri, Jun 13, 2014 at 6:42 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> > +// * Some implementations define fewer names than others. This
> > header has
> > +//   the intersection of all the ones we support.
>
> I don't understand how this problem is helped by this header, if it hurt
> us previously, and why it mattered otherwise. Can you please explain?
>

The only enums available now are the ones we wrote into this header file.
So if you use another one, you *definitely* get a compiler error.
Otherwise, you might add a use of some other enum, and it would compile for
you, but break for others.
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