patch: clarify diagnostic when returned value doesn't match function return type

[Nick Lewycky via cfe-commits]

On 10 August 2015 at 19:08, Nick Lewycky <nlewycky at google.com> wrote:

> This simple-minded patch extends the case where we report "no viable
> conversion from 'X' to 'Y'" to emit a more useful diagnostic "no viable
> conversion from returned value of type 'X' to function return type 'Y'"
> when used in that context.
>
> In lieu of adding tests for this diagnostic explicitly, I've only updated
> the tests where the patch changes their result.
>
> Please review!
>

Ping!
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