Compiling molecule project with scalac2.12.0-M2

[Koen Daenen]

The molecule project (https://github.com/molecule-labs/molecule) compiles with scalac 2.9.3, 2.10.5 and 2.11.7.

The project has a benchmark built-in. It is full of lambda expressions, so I like to see the result of running it on JVM1.8 with the latest scalac 2.12.0-M2

The package molecule-core has no other dependencies than just the standard scala and Java classes, so I started with that,

but the compiler crashed.

Is it to soon in 2.12 roadmap for this kind of tests, or will somebody look into it and fix it in M3 so I can run my benchmark before RC1?

 

Thanks

Koen

[Jason Zaugg]

Bug reports are very, very welcome!

-jason

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[Koen Daenen]

This is what I got

[error] 

[error]   EmptyScope.enter

[error]      while compiling: /Users/daenenk/Workspaces/github/molecule/molecule-core/src/main/scala/molecule/process/CoreProcess.scala

[error]         during phase: globalPhase=lambdalift, enteringPhase=constructors

[error]      library version: version 2.12.0-M2

[error]     compiler version: version 2.12.0-M2

[error]   reconstructed args: -classpath /Users/daenenk/Workspaces/github/molecule/molecule-core/target/jvm-1.8/scala-2.12.0-M2/classes -bootclasspath /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/sunrsasign.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/classes:/Users/daenenk/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.12.0-M2.jar

[error] 

[error]   last tree to typer: TypeTree(class Either)

[error]        tree position: line 478 of /Users/daenenk/Workspaces/github/molecule/molecule-core/src/main/scala/molecule/channel/RChan.scala

[error]             tree tpe: scala.util.Either

[error]               symbol: (sealed abstract) class Either in package util

[error]    symbol definition: sealed abstract class Either extends Product with Serializable (a ClassSymbol)

[error]       symbol package: scala.util

[error]        symbol owners: class Either

[error]            call site: method main in package process

[error] 

[error] == Source file context for tree position ==

[error] 

[error]    475     }

[error]    476 

[error]    477     tmp.fold(signal => Signal.throwException(signal), identity)

[error]    478   }

[error]    479 }

[error]    480 

[error]    481 /**

exception when typing $anon$1.this.<none>

exception when typing $anon$1.this.<none>()

[trace] Stack trace suppressed: run last molecule-core/compile:compileIncremental for the full output.

[error] (molecule-core/compile:compileIncremental) scala.reflect.internal.FatalError: 

[error]   EmptyScope.enter

[error]      while compiling: /Users/daenenk/Workspaces/github/molecule/molecule-core/src/main/scala/molecule/process/CoreProcess.scala

[error]         during phase: globalPhase=lambdalift, enteringPhase=constructors

[error]      library version: version 2.12.0-M2

[error]     compiler version: version 2.12.0-M2

[error]   reconstructed args: -classpath /Users/daenenk/Workspaces/github/molecule/molecule-core/target/jvm-1.8/scala-2.12.0-M2/classes -bootclasspath /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/sunrsasign.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/classes:/Users/daenenk/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.12.0-M2.jar

[error] 

[error]   last tree to typer: TypeTree(class Either)

[error]        tree position: line 478 of /Users/daenenk/Workspaces/github/molecule/molecule-core/src/main/scala/molecule/channel/RChan.scala

[error]             tree tpe: scala.util.Either

[error]               symbol: (sealed abstract) class Either in package util

[error]    symbol definition: sealed abstract class Either extends Product with Serializable (a ClassSymbol)

[error]       symbol package: scala.util

[error]        symbol owners: class Either

[error]            call site: method main in package process

[error] 

[error] == Source file context for tree position ==

[error] 

[error]    475     }

[error]    476 

[error]    477     tmp.fold(signal => Signal.throwException(signal), identity)

[error]    478   }

[error]    479 }

[error]    480 

[error]    481 /**

[error] Total time: 10 s, completed Sep 17, 2015 12:46:05 PM

[Jason Zaugg]

Could you please publish a branch + instructions that I could use to reproduce the error? I didn't manage to do so with the master.

Thanks,

-jason

--

[som-snytt]

I also cloned it but didn't see a branch for 2.12. I'm happy to try something brainlessly, but ask me to modify build.sbt and I go back to my day job.

On Thursday, September 17, 2015 at 4:28:14 AM UTC-7, Jason Zaugg wrote:

Could you please publish a branch + instructions that I could use to reproduce the error? I didn't manage to do so with the master.

Thanks,

-jason

[Koen Daenen]

Thx for responding and sorry I didn't put it all up right on github from the start, which I did now.

Please checkout the branch 'develop'.

launch sbt with a jvm1.8

select the project molecule-core

compile

This should result in the error I posted before.

This is a build definition with multiple projects. As mentioned earlier, let's start with molecule-core as it has no other dependencies and all other projects depends on this one. 

[Jason Zaugg]

Looks like the problem is with typechecking references to overloaded, inherited members of an enclosing package object, and most likely regressed in my commit https://github.com/scala/scala/commit/51745c06f318f859b313c8257a41221837671ac1

I believe that this patch works around the issue in your code base:

https://gist.github.com/retronym/7179a84cb83cd35c8f01

Tracking as https://issues.scala-lang.org/browse/SI-9479. We'll fix this in 2.12.0-M3.

-jason

--

[Koen Daenen]

Thx for the workaround. I now can compile molecule-core, molecule-io, molecule-parsers and molecule-net.