Le 13/11/2022 à 07:44, to...@tuxteam.de a écrit :
You both have a point. Checking for existing predicates with a longer tradition, though:scheme@(guile-user)> (exact? "mumble") ice-9/boot-9.scm:1685:16: In procedure raise-exception: In procedure exact?: Wrong type argument in position 1: "mumble" seems to support Jean Abu's position that it is more customary to raise for an argument of the wrong type. Also `string<?', etc. do this. That seems to be the consensus.
Yes. I am not sure where the people in the Guile IRC got the idea that a predicate shouldn't raise an exception. Lots of predicates in Guile do, and that is very helpful because it catches mistakes.
Naively, it just feel like it (file-exists? #f) should return #f.
Why?
Would there be an objection to changing the definition of file-exists to
(define (file-exists file)
(and (string? file)
(old-file-exists-code file)))
It would be inconsistent with the rest of Guile and I don't see what it would help with. Best, Jean
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