Re: seq-some-p and nil

[Mark Oteiza <mvoteiza@udel.edu>]

On 09/09/15 at 01:28pm, Stephen J. Turnbull wrote:
> Mark Oteiza writes:
>  > On 08/09/15 at 01:50pm, Stefan Monnier wrote:
>  > > >   (defun seq-some (pred seq)
>  > > >     (funcall pred (seq-find (pred seq)))
>  > > 
>  > > But that fails for the case where the element found is nil.
>  > 
>  > Works as expected
> 
> [...]
>  >   (seq-find 'null [1 2 nil])
>  >   ;; => nil
>  > 
>  >   (seq-some 'null [1 2 nil])
>  >   ;; => t
> 
> You have a test coverage problem.
> 
>     (seq-find 'null [1 2])
>     ;; => nil
> 
>     (seq-some 'null [1 2])
>     ;; => t
> 
> I suppose this is the corner case Stefan meant, in the sense that when
> seq-find "finds" (ie, "returns") nil it's impossible to distinguish
> finding nil from not finding nil.

Thanks, that makes sense. I misunderstood