When implementing an interface / protocol with multiple overloads in defrecord / reify this readme https://clojure.org/reference/protocols seems to suggest writing (foo [ ] ...) multiple times. But later on in the readme I see:

(extend-type MyType
  Countable
    (cnt [c] ...)
  Foo
    (bar [x y] ...)
    (baz ([x] ...) ([x y zs] ...)))

It isn't the same for extend type vs reify or defrecord

For defrecord / deftype you do a method per arity (like java without types, because it ends up generating methods for each), for extend type it is like fns with a different body per arity because it actually macro expands to a fn

thanks

Can anyone recommend a Clojure product/library/tool similar to Python's celery (aka task execution from a queue -- https://docs.celeryproject.org/en/stable/getting-started/introduction.html). Or does everyone just kind of roll their own for that sort of work in Clojure?

Hey, I'm trying to upgdate my dependencies with lein ancient and I keep getting this: "Syntax error compiling var at (midje/util/exceptions.clj:75:3).\nUnable to resolve var: aviso.exception/traditional in this context\n"

Does anyone know how this could be fixed?

@franklineapiyo Sounds like a version conflict between one or more libraries. Do you have stuff in your ~/.lein/profiles.clj file? That's often the most common cause of problems with Leiningen.

Yes I do. bu the only thing in there is {:user {:plugins [[lein-ancient "0.6.15"]]}}

And you're getting the exception from lein ancient itself? Or when you try to run the project after it has updated it?

(or are you just trying to get a report of outdated dependencies to update them yourself?)

I'm getting this from just running lein ancient

I've tried to run lein ancient interactive mode and this only happens when I try to upgrade midje, clojure or dk.ative/docjure

trying to upgrade any one of them or all of them at the same time causes this error

not sure if this will help, but try lein with-profile -dev [whatever goes here]

You could just update these things manually -- but the problem looks like recent versions of Midje depend on that var, which was introduced in Aviso Pretty 0.1.15, which all happened a few years ago.

I don't really trust any tools that try to update my project configuration "automatically"...

But @seancorfield, I don't see Aviso Pretty anywhere in my project.clj... I'm a bit of a newb.. how should I update something that isn't in my project.clj... I think it's a dependency of something that's in my dependencies correct?

Part of me feels like saying "Stop using Midje -- that's part of your problem"... 🙂

Since this is probably going to be a fair bit of hand-holding to get to the bottom of this and you're fairly new to Clojure, perhaps share your project.clj file in #beginners where folks have opted in to spending more time digging into basic problems like this (I'm happy to continue digging into it in #beginners )

sweet!

(there's an expectation in this channel that you can mostly debug dependency conflicts on your own)