Subject: bug#59221: (file-exists? #f) raises an exception

From: Jean Abou Samra <[email-masked]>
Date: Sat, 12 Nov 2022 18:57:20 +0100

> Le 12 nov. 2022 à 18:50, Joshua Branson via Bug reports for GUILE, GNU's Ubiquitous Extension Language <[email-masked]> a écrit :
> 
> 
> Hello you lovely guile people!
> 
> This bug is so simple the subject line says it all!
> 
> file-exists? is a predicate, but
> 
> #+BEGIN_SRC scheme
> (file-exists? #f)
> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> In procedure stat: Wrong type argument in position 1 (expecting open file port): #f
> 
> Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
> #+END_SRC
> 
> I will shortly tag this as "easy".  Can you lovely maintainers give me
> about a week to try to fix this myself?
> 
> Thanks,
> 
> Joshua
> avid fantany reader

What’s the problem here?

It is normal for predicates to be defined only on certain types. You will find the same with positive?, string-null? and the like.

Regards,
Jean