Completion arity of transducer is called twice

Description

completion arity (1) of a transducer function is called twice in a channel

will print

According to https://clojure.org/reference/transducers, it is probably a bug:

> A completing process must call the completion operation on the final accumulated value exactly once

Looks like completing fn is called at there places in core.async: https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/channels.cljs#L122 https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/channels.cljs#L146

Environment

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Assignee

Unassigned

Reporter

Jozef Wagner

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Patch

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Priority

Major
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