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

[Vedant Kumar via cfe-commits]

LGTM with a caveat.

Changing diagnostic messages is scary because it can inadvertently break tools and IDE's. So there is a chance someone might want this reverted in the future. But for now it seems helpful :).

vedant

On Aug 24, 2015, at 1:19 PM, Nick Lewycky via cfe-commits <cfe-commits at lists.llvm.org> wrote:

> On 19 August 2015 at 15:18, Nick Lewycky <nlewycky at google.com> wrote:
> 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!
> 
> Ping! 
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