Compile-time exception on 0.1.6 when using Scala 3.3.0-RC5 with `-Wunused:all`

[chuwy]

Tried to upgrade from 0.1.4 to 0.1.6 and getting the following exception, presumably related to #48.

[error] ## Exception when compiling 102 sources to /Users/.../target/scala-3.3.0-RC5/classes
[error] dotty.tools.dotc.core.TypeError$$anon$1: Toplevel definition inline$Transformations$i1 is defined in
[error]   /Users/chuwy/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/io/github/arainko/ducktape_3/0.1.6/ducktape_3-0.1.6.jar(io/github/arainko/ducktape/fallibleSyntax$package.class)
[error] and also in
[error]   /Users/chuwy/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/io/github/arainko/ducktape_3/0.1.6/ducktape_3-0.1.6.jar(io/github/arainko/ducktape/syntax$package.class)
[error] One of these files should be removed from the classpath.

Apart from above lines I don't see any other useful info, just a bunch of my files listed.

Scalac 3.3.0-RC5, 0.1.5 compiles fine.

[arainko]

Thanks for the report!

Does this occur at any particular usage site or does it just die without much fanfare?

I'm unable to reproduce this locally (using this repo: https://github.com/arainko/ducktape-talk) - the project compiles just fine on Scala 3.2.2:

sbt:root> compile
[info] compiling 2 Scala sources to /home/aleksander/repos/ducktape-talk/libs/newtypes/target/scala-3.2.2/classes ...
[info] compiling 9 Scala sources to /home/aleksander/repos/ducktape-talk/modules/domain/target/scala-3.2.2/classes ...
[info] compiling 4 Scala sources to /home/aleksander/repos/ducktape-talk/modules/infrastructure/target/scala-3.2.2/classes ...
[info] compiling 18 Scala sources to /home/aleksander/repos/ducktape-talk/http/target/scala-3.2.2/classes ...
[success] Total time: 30 s, completed May 2, 2023, 2:35:54 PM

The same for Scala 3.3.0-RC5:

[info] compiling 4 Scala sources to /home/aleksander/repos/ducktape-talk/libs/newtypes/target/scala-3.3.0-RC5/classes ...
[info] compiling 9 Scala sources to /home/aleksander/repos/ducktape-talk/modules/domain/target/scala-3.3.0-RC5/classes ...
[info] compiling 4 Scala sources to /home/aleksander/repos/ducktape-talk/modules/infrastructure/target/scala-3.3.0-RC5/classes ...
[info] compiling 18 Scala sources to /home/aleksander/repos/ducktape-talk/http/target/scala-3.3.0-RC5/classes ...
[success] Total time: 9 s, completed May 2, 2023, 2:39:37 PM

Is the project that crashes open source? If not, would you be able to at least share your build configuration (scalac flags etc.)?

[arainko]

After some more playing around with it I'm able to reproduce it by using -Wunused:all on Scala 3.3.0-RC5. That sadly smells like a dotty issue to me - I'll try to minimize

[arainko]

Just released ducktape 0.1.7 with a workaround for this issue - I'll still make sure to report this to the dotty maintainers.