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

[Daimrod]

Helmut Eller <eller.helmut@gmail.com> writes:

> pcase returns nil for this example:
>
>  (pcase 3
>    (1 1)
>    (2 2))
>
> it would be more useful if it would signal an error instead.  Manually
> adding a "catch-all case" and inventing some error message is tedious
> and it's also easy to forget.

Wouldn't a `epcase' (as in `cl-ecase') be more appropriate for this
use-case?

-- 
Daimrod/Greg