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clojure-dev 2026-09-04
borkdude 2026-09-04T11:52:38.716929Z
Will proxy also get the default method support that gen-class now has?
(def p (proxy [java.util.function.Function] [] (apply [x] (inc x))))
(.apply p 1) ; => 2
(.apply (.andThen p p) 1) ; => UnsupportedOperationException: andThen
Might be somewhat related, as in proxy and default method: https://clojure.atlassian.net/browse/CLJ-2617
👍 1
Alex Miller (Clojure team) 2026-09-04T14:31:40.601339Z
that's a good question, will take some more thought. Java proxies don't surface interface default methods, everything goes through the proxy. they added a way to write your own call-through in proxies with InvocationHandler.invokeDefault() in Java 16 (which we are now past in Clojure 1.13)
Alex Miller (Clojure team) 2026-09-04T14:33:13.017129Z
as with gen-class, proxy was created before default and static methods on interfaces existed, and needs to be re-examined
The example given was reify but you mentioned gen-class…
borkdude 2026-09-04T15:16:16.381109Z
yeah sorry. reify is fine. gen-class is fine now too (in 1.12.6). I wonder if proxy could be fixed too and CLJ-2617 seems to be the relevant ticket for it. thanks.
borkdude 2026-09-04T15:19:16.861859Z
fixing proxy might let me remove a gnarly custom byte-code generating thing in babashka. it's not urgent since this workaround has been in place since 2022 and it works fine.
borkdude 2026-09-04T13:05:54.301309Z
Another question:
is dropping nil-valued input entries in :excess intended, given that :all keeps them?
@borkdude do you have an example?
borkdude 2026-09-04T13:39:25.675269Z
user=> (let [{:keys [a] :excess ex} {:a 1 :b 2 :z nil}] ex)
;;=> {:b 2}👍 1