xiaobai added a comment.

In https://reviews.llvm.org/D39307#907220, @clayborg wrote:

> It is a nice idea. I would still rather fix this in clang so it doesn't ask 
> us about a variable it already knows about. Though this might be a good 
> solution until we can fix it for real though. Sean or Jim?


From what I can tell, in clang it looks like it's looking for a redeclaration 
of parameters (something like `int foo(int x, int x)`). Not entirely sure why 
it does that, and I'm not entirely sure why it would need to look beyond the 
Function Declaration scope to do that. When I get a chance, I can look into it 
more.


https://reviews.llvm.org/D39307



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