Under -Wunused:imports Scala 3 reports false warnings:
[warn] Unable to find a link for Id(Project) in extraProjects: dotty.tools.dotc.core.TypeError$$anon$1:
Toplevel definition overrideConfigs is defined in
[warn] /home/runner/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/main_3/2.0.0-M2/main_3-2.0.0-M2.jar(sbt/BuildCommon.class)
[warn] and also in
[warn] /home/runner/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/main_3/2.0.0-M2/main_3-2.0.0-M2.jar(sbt/ProjectExtra.class)
[warn] One of these files should be removed from the classpath.
Expectation
I have not looked into the details, but it seems like there's a feature interference between the -Wunused:imports linter and "One of these files should be removed from the classpath" error in dropStale (https://github.com/scala/scala3/blob/cc4a32451cec3b45d5c5c06a126fa37c8381ae72/compiler/src/dotty/tools/dotc/core/SymDenotations.scala#L2546-L2557). Given that we want to take the linters seriously, for example by paying attention, or turning them into -Werror, I suggest one of the two features to be removed in the short-term, assuming removal of a linter is relatively easy thing to do.
If someone has the bandwidth to fix the interference, then the linter can always come back.
Steps
See https://github.com/scala/scala3/issues/17394, which was reported in May 2023 See also https://github.com/sbt/sbt/issues/7726
Problem
Under
-Wunused:importsScala 3 reports false warnings:Expectation
I have not looked into the details, but it seems like there's a feature interference between the
-Wunused:importslinter and "One of these files should be removed from the classpath" error indropStale(https://github.com/scala/scala3/blob/cc4a32451cec3b45d5c5c06a126fa37c8381ae72/compiler/src/dotty/tools/dotc/core/SymDenotations.scala#L2546-L2557). Given that we want to take the linters seriously, for example by paying attention, or turning them into-Werror, I suggest one of the two features to be removed in the short-term, assuming removal of a linter is relatively easy thing to do.If someone has the bandwidth to fix the interference, then the linter can always come back.