MIMA Binary compatibility breakage in case class copy method default getter upgrading from Scala 3.7.4 -> 3.8.0-RC3

[lihaoyi]

A similar issue to #24553 but with a different cause that remains after that other one was fixed. Encountered when trying to update Mill's codebase to 3.8.0-RC3 in com-lihaoyi/mill#6320

Compiler version

3.8.0-RC3

Minimized code

final case class Foo[+T](t: T)

• Download and unpack test 2.zip
• Run ./mill mimaReportBinaryIssues

Output

125] mimaReportBinaryIssues Scanning binary compatibility in /Users/lihaoyi/test/test/out/foo380/jar.dest/out.jar ...
125] Found 2 issue when checking against old
125]  * synthetic method copy$default$1()java.lang.Object in class Foo has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()TT; rather than <T:Ljava/lang/Object;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
125]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("Foo.copy$default$1")
125]  * synthetic method copy$default$1()foo.Bar in class foo.Foo has a different generic signature in current version, where it is <T1::Lfoo/Bar;>()TT; rather than <T::Lfoo/Bar;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
125]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("foo.Foo.copy$default$1")

Expectation

I expect upgrading from 3.7.4 to 3.8.0-RC3 should not cause MIMA failures

There are a bunch of other errors in the logs of the associated CI run (https://github.com/com-lihaoyi/mill/actions/runs/19950109782/job/57208576332?pr=6320), and I suspect there may be multiple different issues remaining not just the one minimized above. Seems like the problem with exports in to #24553 may not be entirely fixed yet as I'm seeing many export-related MIMA failures trying to update Mill to 3.8.0-RC3

2019] core.api.mimaReportBinaryIssues
2019] Scanning binary compatibility in /home/runner/work/mill/mill/out/core/api/jar.dest/out.jar ...
2019] Found 2 issue when checking against com.lihaoyi:mill-core-api_3:VersionConstraint.Lazy(1.0.0, VersionInterval(None, None, false, false), Some(Version(1.0.0)), None)
2019]  * synthetic method copy$default$2()mill.api.daemon.Result in class mill.api.Evaluator#Result has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>; rather than <T:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.Evaluator#Result.copy$default$2")
2019]  * synthetic method copy$default$1()mill.api.Module in class mill.api.ModuleRef has a different generic signature in current version, where it is <T1::Lmill/api/Module;>()TT; rather than <T::Lmill/api/Module;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.ModuleRef.copy$default$1")
2028] core.internal.cli.compile
2028] compiling 1 Scala source to out/core/internal/cli/compile.dest/classes ...
2019] Found 2 issue when checking against com.lihaoyi:mill-core-api_3:VersionConstraint.Lazy(1.0.1, VersionInterval(None, None, false, false), Some(Version(1.0.1)), None)
2019]  * synthetic method copy$default$2()mill.api.daemon.Result in class mill.api.Evaluator#Result has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>; rather than <T:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.Evaluator#Result.copy$default$2")
2019]  * synthetic method copy$default$1()mill.api.Module in class mill.api.ModuleRef has a different generic signature in current version, where it is <T1::Lmill/api/Module;>()TT; rather than <T::Lmill/api/Module;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.ModuleRef.copy$default$1")
2019] Found 2 issue when checking against com.lihaoyi:mill-core-api_3:VersionConstraint.Lazy(1.0.2, VersionInterval(None, None, false, false), Some(Version(1.0.2)), None)
2019]  * synthetic method copy$default$2()mill.api.daemon.Result in class mill.api.Evaluator#Result has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>; rather than <T:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.Evaluator#Result.copy$default$2")
2019]  * synthetic method copy$default$1()mill.api.Module in class mill.api.ModuleRef has a different generic signature in current version, where it is <T1::Lmill/api/Module;>()TT; rather than <T::Lmill/api/Module;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.ModuleRef.copy$default$1")
2028] done compiling
2042] libs.util.mimaReportBinaryIssues
2042] Scanning binary compatibility in /home/runner/work/mill/mill/out/libs/util/jar.dest/out.jar ...
2042] Found 15 issue when checking against com.lihaoyi:mill-libs-util_3:VersionConstraint.Lazy(1.0.0, VersionInterval(None, None, false, false), Some(Version(1.0.0)), None)
2042]  * static method bytesReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lgeny/Bytes;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.bytesReadWrite")
2042]  * static method crFormat()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/CommandResult;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.crFormat")
2019] Found 2 issue when checking against com.lihaoyi:mill-core-api_3:VersionConstraint.Lazy(1.0.3, VersionInterval(None, None, false, false), Some(Version(1.0.3)), None)
2042]  * static method nioPathRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/nio/file/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.nioPathRW")
2019]  * synthetic method copy$default$2()mill.api.daemon.Result in class mill.api.Evaluator#Result has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>; rather than <T:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.Evaluator#Result.copy$default$2")
2042]  * static method pathReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.pathReadWrite")
2019]  * synthetic method copy$default$1()mill.api.Module in class mill.api.ModuleRef has a different generic signature in current version, where it is <T1::Lmill/api/Module;>()TT; rather than <T::Lmill/api/Module;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.ModuleRef.copy$default$1")
2042]  * static method regexReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lscala/util/matching/Regex;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.regexReadWrite")
2042]  * static method relPathRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/RelPath;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.relPathRW")
2042]  * static method stackTraceRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/lang/StackTraceElement;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.stackTraceRW")
2042]  * method pathReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.pathReadWrite")
2042]  * method nioPathRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/nio/file/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.nioPathRW")
2042]  * method regexReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lscala/util/matching/Regex;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.regexReadWrite")
2042]  * method stackTraceRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/lang/StackTraceElement;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.stackTraceRW")
2042]  * method relPathRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/RelPath;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]  * static method regexReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lscala/util/matching/Regex;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.regexReadWrite")
2042]  * static method relPathRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/RelPath;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.relPathRW")
2042]  * static method stackTraceRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/lang/StackTraceElement;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.stackTraceRW")
2042]  * method bytesReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lgeny/Bytes;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.bytesReadWrite")
2042]  * method pathReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.pathReadWrite")
2042]  * method regexReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lscala/util/matching/Regex;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.regexReadWrite")
2042]  * method crFormat()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/CommandResult;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.crFormat")
2042]  * method relPathRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/RelPath;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.relPathRW")
2042]  * method nioPathRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/nio/file/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.nioPathRW")
2042]  * method stackTraceRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/lang/StackTraceElement;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.stackTraceRW")
2042]  * synthetic method copy$default$1()scala.collection.immutable.Seq in class mill.util.Tasks has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lscala/collection/immutable/Seq<Lmill/api/Task$Named<TT;>;>; rather than <T:Ljava/lang/Object;>()Lscala/collection/immutable/Seq<Lmill/api/Task$Named<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.util.Tasks.copy$default$1")
2042] Found 15 issue when checking against com.lihaoyi:mill-libs-util_3:VersionConstraint.Lazy(1.0.6, VersionInterval(None, None, false, false), Some(Version(1.0.6)), None)
2042]  * static method bytesReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lgeny/Bytes;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.bytesReadWrite")
2042]  * static method crFormat()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/CommandResult;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.crFormat")
2042]  * static method nioPathRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/nio/file/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.nioPathRW")
2042]  * static method pathReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.pathReadWrite")
2042]  * static method regexReadWrite()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lscala/util/matching/Regex;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.regexReadWrite")
2042]  * static method relPathRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/RelPath;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.relPathRW")
2042]  * static method stackTraceRW()upickle.core.Types#ReadWriter in class mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/lang/StackTraceElement;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.stackTraceRW")
2042]  * method bytesReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lgeny/Bytes;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.bytesReadWrite")
2042]  * method pathReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.pathReadWrite")
2042]  * method stackTraceRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/lang/StackTraceElement;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.stackTraceRW")
2042]  * method relPathRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/RelPath;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.relPathRW")
2042]  * method crFormat()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Los/CommandResult;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.crFormat")
2042]  * method regexReadWrite()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Lscala/util/matching/Regex;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.regexReadWrite")
2042]  * method nioPathRW()upickle.core.Types#ReadWriter in object mill.exports#package has a different generic signature in current version, where it is ()Lupickle/core/Types$ReadWriter<Ljava/nio/file/Path;>; rather than ()Lupickle/core/Types$ReadWriter;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.exports#package.nioPathRW")
2042]  * synthetic method copy$default$1()scala.collection.immutable.Seq in class mill.util.Tasks has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lscala/collection/immutable/Seq<Lmill/api/Task$Named<TT;>;>; rather than <T:Ljava/lang/Object;>()Lscala/collection/immutable/Seq<Lmill/api/Task$Named<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2042]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.util.Tasks.copy$default$1")
2019] Found 2 issue when checking against com.lihaoyi:mill-core-api_3:VersionConstraint.Lazy(1.0.6, VersionInterval(None, None, false, false), Some(Version(1.0.6)), None)
2019]  * synthetic method copy$default$2()mill.api.daemon.Result in class mill.api.Evaluator#Result has a different generic signature in current version, where it is <T1:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>; rather than <T:Ljava/lang/Object;>()Lmill/api/daemon/Result<Lscala/collection/immutable/Seq<TT;>;>;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.Evaluator#Result.copy$default$2")
2019]  * synthetic method copy$default$1()mill.api.Module in class mill.api.ModuleRef has a different generic signature in current version, where it is <T1::Lmill/api/Module;>()TT; rather than <T::Lmill/api/Module;>()TT;. See https://github.com/lightbend-labs/mima#incompatiblesignatureproblem
2019]    filter with: ProblemFilter.exclude[IncompatibleSignatureProblem]("mill.api.ModuleRef.copy$default$1")
2019/2214, 2 failed] ================== __.mimaReportBinaryIssues ================== 70s
2042] [error] libs.util.mimaReportBinaryIssues Failed binary compatibility check! Found 105 potential problems (filtered 28)
2019] [error] core.api.mimaReportBinaryIssues Failed binary compatibility check! Found 14 potential problems (filtered 133)

[Gedochao]

cc @hamzaremmal @sjrd

[hamzaremmal]

It's because of #24567.

[Gedochao]

cc @tanishiking

[tanishiking]

Yeah it seems it's caused by #24567 👀

[tanishiking]

Ah, as @hamzaremmal mentioned in #24567 (comment) we need more robust algorithm in a way that we do not rename when Name is the same (even when the sanitizedString is the same). ?

[sjrd]

The new signatures seem fine here. They're (uselessly) textually different, which trips MiMa up, but they're still correct.

We could avoid renaming type parameters that shadow things that are not actually used in the method. That would avoid this particular complaint by MiMa, but ultimately it wouldn't make the end result any better or worse.

[hamzaremmal]

The new signatures seem fine here. They're (uselessly) textually different, which trips MiMa up, but they're still correct.

We could avoid renaming type parameters that shadow things that are not actually used in the method. That would avoid this particular complaint by MiMa, but ultimately it wouldn't make the end result any better or worse.

I agree, that's what I told @Gedochao too.

[Gedochao]

We could avoid renaming type parameters that shadow things that are not actually used in the method.

Do we want to, then? Or should we close it as wontfix?

[tgodzik]

Would it be possible to rename those type params back to avoid this issue altogether?