bug#16567: 24.3.50; pcase should signal an error if no case matches

[Leo Liu]

On 2014-09-10 09:17 -0400, Stefan Monnier wrote:
> unless you're concerned about line-length and
> indentation (in which case the length of `pcase-exhaustive' may indeed
> occasionally force you to use an extra line).
>
> I'm open to other suggestions, and `pcasex' is not unacceptable, so
> I think we're closing in.

pcasex = PCASe + EXhaustive

Yes, line length and indentation is my main concern. 

Leo