bug#68509: 30.0.50; pcase-dolist matches backquote pattern incorrectly

[Ihor Radchenko]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> In my patch, I proposed to skip such elements.
>> An alternative could be throwing an error.
>
> As I said, what you propose is a *different* construct.
> Maybe we should add some extra option/keyword to `pcase-dolist` to
> indicate what to do with elements that don't match (such as signaling
> an error, a warning, silently skipping it, ...).
>
> Similar issues affect `pcase-let`, of course.

What about adding extra option/keyword and also showing a runtime
warning when pcase-dolist/pcase-let encounter something that does not
match the pattern? In such situation, the code logic probably has a
problem that is worth highlighting.

-- 
Ihor Radchenko // yantar92,
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