erichkeane added a comment.

In, @efriedma wrote:

> Rather than adding weird hacks to merging, can we just reject any attempt to 
> redeclare a builtin?

I don't believe we can.  I think things often re-declare them, particularly 
when it comes to va_end.  I'd love to move the 'builtinID' check higher and 
reject any attempts to redeclare in C, but I'd like some further guidance.  Do 
you know of anyone who can help us make that decision?

  rC Clang

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