https://gist.github.com/samedhi/3ec2d55f2a9b554c74737b347a911210

(above) Having a bit of confusion about when specs can be used in :ret and when they can be used in spec/and.

@samedhi the :fn on line 24 is not supposed to be a spec

it's supposed to be a function that compares the args and the return value

and you can leave it off if you don't have anything obvious to check

that might not be your problem, I'm just guessing

@gfredericks Looking at http://clojure.github.io/clojure/branch-master/clojure.spec-api.html#clojure.spec/fdef, seems like a spec should be ok.

Oh, you mean within it

Yes, it does state it takes a spec, but it should “contain predicates"

innnteresting

I would wager "A spec of the relationship..." is a typo, unless things have changed recently

I'll check on that actually

what's the latest clojure version

1.9.0-alpha13 I think?

looks like there's 13

Yeah, I just checked and saw that. 🙂

> Note that :fn specs require the presence of :args and :ret specs to conform values, and so :fn specs will be ignored if :args or :ret are missing.

Ugh, that line alone would have saved me hooours. I don’t know what you can do for people who don’t read the api docs (sorry), but figuring this out on my own just hurt.

Maybe a warning if you include a :fn but not :args and :ret

looks like the s/and thing does work, and I don't know why

so TIL I guess

@gfredericks Sounds good, yeah, no idea. Thanks for you help. TIL I should always read the docs right after going through the getting started section 😬