[clang 17456] reference cast diagnostic for unrelated classes

[Nathan Sidwell]

Ping?

On 02/06/15 16:44, Nathan Sidwell wrote:
> Richard,
> here's the reference-cast case of the unrelated hierarchy patch I recently
> created for ptr-to-class (http://llvm.org/bugs/show_bug.cgi?id=17456).  I had a
> bit of a struggle coming up with a nicely worded diagnostic.  This now produces:
>
> 17456-2.cc:6:10: error: non-const lvalue reference to class 'B' cannot bind to a
> value of class 'A', which is not related by inheritance
>    return static_cast<B&>(arg);
>           ^               ~~~
> when the src and target reference types are classes.  It also notes if either is
> incomplete.
>
> ok?
>
> nathan

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