clj-kondo 2021-10-19 | Slack Archive

jumar07:10:30

I've just found a serious bug in our production code using something like (rseq (map ... This fails because rseq doesn't work on lazy seqs but requires a vector or a sorted map

(rseq (map inc (range 10)))
;;=>
Execution error (ClassCastException) at ...
clojure.lang.LazySeq cannot be cast to clojure.lang.Reversible

Is this something that clj-kondo could warn against? I understand that this is not a prevalent use case just wondering if that's possible or desirable.

borkdude07:10:23

Yes, clj-kondo has a type system which can be used for this. We just need to add the types for rseq

borkdude07:10:39

Feel free to make an issue

borkdude09:10:13

https://github.com/clj-kondo/clj-kondo/issues/1432

borkdude17:10:34

2021-10-19

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