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False unused import with -Wunused:imports #19912

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joan38 opened this issue Mar 10, 2024 · 1 comment
Open

False unused import with -Wunused:imports #19912

joan38 opened this issue Mar 10, 2024 · 1 comment
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area:linting Linting warnings enabled with -W or -Xlint itype:bug

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@joan38
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joan38 commented Mar 10, 2024

import cats.derived.auto.semigroup.given is reported used but if removed it was actually used.
import cats.derived.auto.semigroup.given Semigroup[?] same issue.
import cats.derived.auto.semigroup.given_Semigroup_A works fine.

Identified in kittens 3.3.0 but works with kittens 3.2.0 typelevel/kittens#655
I believe this is related to the transparent implementation for givens.

Compiler version

Reproducable in 3.3.3 and 3.4.0

Minimized code

https://scastie.scala-lang.org/Po0uhQLgSjyzEdnffZLi1g
@joan38 joan38 added itype:bug stat:needs triage Every issue needs to have an "area" and "itype" label labels Mar 10, 2024
@Gedochao Gedochao added area:linting Linting warnings enabled with -W or -Xlint and removed stat:needs triage Every issue needs to have an "area" and "itype" label labels Mar 12, 2024
@Gedochao
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Looks similar to #18564 and #19657
@szymon-rd is this a duplicate?

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