Compiler crash with 2.12.0 and 2.11.8

[Jacques Lemieux]

I have this exception below when I compile my project with SBT. This is with Scala 2.12.0, but it was crashing at the same place under Scala 2.11.8 last Friday.

It is very dificult for me to find what is triggering this exception because I did a huge code refactoring exercise last week and tens if not hundreds of classes were affected. 

Where should I report this issue?

Thank you.

JL

==================

[debug] Calling Scala compiler with arguments  (CompilerInterface):

[debug] -feature

[debug] -language:postfixOps

[debug] -language:implicitConversions

[debug] -language:higherKinds

[debug] -language:existentials

[debug] -bootclasspath

[debug] /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/classes:/home/jacques/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.12.0.jar

[debug] -classpath

[debug] /home/jacques/Documents/Projects/ActorDemo/core/target/scala-2.12/classes:/home/jacques/Documents/Projects/ActorDemo/core/lib/ojdbc7.jar:/home/jacques/.ivy2/cache/com.typesafe.scala-logging/scala-logging_2.12/bundles/scala-logging_2.12-3.5.0.jar:/home/jacques/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.12.0.jar:/home/jacques/.ivy2/cache/org.slf4j/slf4j-api/jars/slf4j-api-1.7.21.jar:/home/jacques/.ivy2/cache/ch.qos.logback/logback-classic/jars/logback-classic-1.1.7.jar:/home/jacques/.ivy2/cache/ch.qos.logback/logback-core/jars/logback-core-1.1.7.jar:/home/jacques/.ivy2/cache/junit/junit/jars/junit-4.12.jar:/home/jacques/.ivy2/cache/org.hamcrest/hamcrest-core/jars/hamcrest-core-1.3.jar:/home/jacques/.ivy2/local/com.coremigration/coremigration-i18n-rt_2.12/1.0.0-SNAPSHOT/jars/coremigration-i18n-rt_2.12.jar

java.util.NoSuchElementException: head of empty list

at scala.collection.immutable.Nil$.head(List.scala:417)

at scala.collection.immutable.Nil$.head(List.scala:414)

at scala.tools.nsc.typechecker.ContextErrors$InferencerContextErrors$InferErrorGen$.NotWithinBoundsErrorMessage(ContextErrors.scala:1048)

at scala.tools.nsc.typechecker.ContextErrors$InferencerContextErrors$InferErrorGen$.NotWithinBounds(ContextErrors.scala:1055)

at scala.tools.nsc.typechecker.Infer$Inferencer.issueBoundsError$1(Infer.scala:889)

at scala.tools.nsc.typechecker.Infer$Inferencer.check$1(Infer.scala:895)

at scala.tools.nsc.typechecker.Infer$Inferencer.checkBounds(Infer.scala:899)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.checkBounds(RefChecks.scala:1203)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.checkTypeRef(RefChecks.scala:1384)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.$anonfun$transform$4(RefChecks.scala:1662)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.$anonfun$transform$4$adapted(RefChecks.scala:1653)

at scala.reflect.internal.tpe.TypeMaps$ForEachTypeTraverser.traverse(TypeMaps.scala:1072)

at scala.reflect.internal.Types$Type.foreach(Types.scala:767)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1407)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:107)

at scala.reflect.internal.Trees.$anonfun$itransform$2(Trees.scala:1367)

at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)

at scala.reflect.internal.Trees.itransform(Trees.scala:1365)

at scala.reflect.internal.Trees.itransform$(Trees.scala:1340)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1745)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1198)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.$anonfun$transformStats$1(RefChecks.scala:1169)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1169)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:107)

at scala.reflect.internal.Trees.itransform(Trees.scala:1408)

at scala.reflect.internal.Trees.itransform$(Trees.scala:1340)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1745)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:107)

at scala.reflect.api.Trees$Transformer.transformTemplate(Trees.scala:2563)

at scala.reflect.internal.Trees.$anonfun$itransform$4(Trees.scala:1412)

at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)

at scala.reflect.internal.Trees.itransform(Trees.scala:1411)

at scala.reflect.internal.Trees.itransform$(Trees.scala:1340)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1745)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1198)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.$anonfun$transformStats$1(RefChecks.scala:1169)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1169)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:107)

at scala.reflect.internal.Trees.$anonfun$itransform$7(Trees.scala:1430)

at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)

at scala.reflect.internal.Trees.itransform(Trees.scala:1430)

at scala.reflect.internal.Trees.itransform$(Trees.scala:1340)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1745)

at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:107)

at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:140)

at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)

at scala.tools.nsc.Global$GlobalPhase.$anonfun$applyPhase$1(Global.scala:402)

at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:395)

at scala.tools.nsc.Global$GlobalPhase.$anonfun$run$1(Global.scala:366)

at scala.tools.nsc.Global$GlobalPhase.$anonfun$run$1$adapted(Global.scala:366)

at scala.collection.AbstractIterator.foreach(Iterator.scala:932)

at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:366)

at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1404)

at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1389)

at scala.tools.nsc.Global$Run.compileSources(Global.scala:1384)

at scala.tools.nsc.Global$Run.compile(Global.scala:1478)

at xsbt.CachedCompiler0.run(CompilerInterface.scala:116)

at xsbt.CachedCompiler0.run(CompilerInterface.scala:95)

at xsbt.CompilerInterface.run(CompilerInterface.scala:26)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:107)

at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:53)

at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:47)

at sbt.compiler.MixedAnalyzingCompiler$$anonfun$compileScala$1$1.apply$mcV$sp(MixedAnalyzingCompiler.scala:50)

at sbt.compiler.MixedAnalyzingCompiler$$anonfun$compileScala$1$1.apply(MixedAnalyzingCompiler.scala:50)

at sbt.compiler.MixedAnalyzingCompiler$$anonfun$compileScala$1$1.apply(MixedAnalyzingCompiler.scala:50)

at sbt.compiler.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:74)

at sbt.compiler.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:49)

at sbt.compiler.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:64)

at sbt.compiler.IC$$anonfun$compileInternal$1.apply(IncrementalCompiler.scala:160)

at sbt.compiler.IC$$anonfun$compileInternal$1.apply(IncrementalCompiler.scala:160)

at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:66)

at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:64)

at sbt.inc.IncrementalCommon.cycle(IncrementalCommon.scala:32)

at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:72)

at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:71)

at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:99)

at sbt.inc.Incremental$.compile(Incremental.scala:71)

at sbt.inc.IncrementalCompile$.apply(Compile.scala:54)

at sbt.compiler.IC$.compileInternal(IncrementalCompiler.scala:160)

at sbt.compiler.IC$.incrementalCompile(IncrementalCompiler.scala:138)

at sbt.Compiler$.compile(Compiler.scala:155)

at sbt.Compiler$.compile(Compiler.scala:141)

at sbt.Defaults$.sbt$Defaults$$compileIncrementalTaskImpl(Defaults.scala:879)

at sbt.Defaults$$anonfun$compileIncrementalTask$1.apply(Defaults.scala:870)

at sbt.Defaults$$anonfun$compileIncrementalTask$1.apply(Defaults.scala:868)

at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)

at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)

at sbt.std.Transform$$anon$4.work(System.scala:63)

at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)

at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)

at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)

at sbt.Execute.work(Execute.scala:237)

at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)

at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)

at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)

at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

[error] (compile:compileIncremental) java.util.NoSuchElementException: head of empty list

[Seth Tisue]

Perhaps it’s https://issues.scala-lang.org/browse/SI-10066