[patch][pr17624] Consider hidden decls for isUsed checks

[Rafael Espíndola]

Rebased patch attached.

On 19 October 2013 18:51, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> Hi Richard,
>
> The attached patch fixes pr17624, but I worry there might be more bugs
> like this. Some analysis must ignore hidden decls so that, for
> example, we accept
>
> void f4() {
>   void g4(int a, int b = 7);
>   {
>     void g4(int a, int b = 5);
>   }
>   void g4(int a = 5, int b);
> }
>
> but is isUsed really the only check that has to consider the true most
> recent decl?
>
> Cheers,
> Rafael
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