IRC channel logs

<old>!help ident

<old>!who #guile

<gnucode>hey guile... is this a predicate ?

<gnucode>(lambda (x) (if (string? x) #t (throw 'bad! x)))

<gnucode>My gut tells me no. that predicates should not be able to raise exceptions...

<old>By definition I think that a predicate either return #t or #f

<old>no exception

<lilyp>gnucode: it's a predicate as long as you wrap it in false-if-exception :P

<gnucode>lilyp: hmmm.

<gnucode>it's actually kind of funny because then file-exists? is not a predicate.

<gnucode>(file-exists? #f)

<gnucode>raises an exception

<gnucode>I'll add that to me tiny hacks that I eventually need to do.

<gnucode>also I just sent the biug report.

<mwette>I think it's OK to raise an exception if input arguments are not consistent with the definition of the preditate.

<old>file-exists? expect number (file descriptor) or path or port I think

<old>So it makes sens for it to throw an exception I guess?

2022-11-12.log