an unexpected type representation reached the compiler backend while compiling Sample.scala: <error>

[sca...@tutanota.com]

Not sure if this is a bug in compiler so double check here first. 

I try compiling some code, but scala compiler complains there is internal error. My environment:

scala: 2.11.8 (also try 2.12.0-M4)

sbt: 0.13.11

java: 1.8.0_91

When compiling with 2.11.8 it has similar error except 2.12.0-M4 asks me to file a bug report. 

The error shows like below:

 

an unexpected type representation reached the compiler backend while compiling Sample.scala: <error>. If possible, please file a bug on issues.scala-lang.org.

scala.MatchError: <error> (of class scala.reflect.internal.Types$ErrorType$)

at scala.tools.nsc.backend.jvm.BTypesFromSymbols.typeToBType(BTypesFromSymbols.scala:210)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.symInfoTK(BCodeSkelBuilder.scala:77)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:367)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genArrayOp(BCodeBodyBuilder.scala:177)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genPrimitiveOp(BCodeBodyBuilder.scala:234)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:683)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genStat(BCodeBodyBuilder.scala:88)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.scala$tools$nsc$backend$jvm$BCodeBodyBuilder$PlainBodyBuilder$$$anonfun$29(BCodeBodyBuilder.scala:845)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genBlock(BCodeBodyBuilder.scala:845)

at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:381)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.emitNormalMethodBody$1(BCodeSkelBuilder.scala:596)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genDefDef(BCodeSkelBuilder.scala:628)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:502)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.scala$tools$nsc$backend$jvm$BCodeSkelBuilder$PlainSkelBuilder$$$anonfun$22(BCodeSkelBuilder.scala:504)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:504)

at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genPlainClass(BCodeSkelBuilder.scala:115)

at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.visit(GenBCode.scala:189)

at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.scala$tools$nsc$backend$jvm$GenBCode$BCodePhase$Worker1$$$anonfun$1(GenBCode.scala:138)

at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.run(GenBCode.scala:138)

at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.buildAndSendToDisk(GenBCode.scala:375)

at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.run(GenBCode.scala:344)

at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1483)

at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1468)

at scala.tools.nsc.Global$Run.compileSources(Global.scala:1463)

at scala.tools.nsc.Global$Run.compile(Global.scala:1557)

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:101)

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

at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)

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:68)

at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:67)

at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:95)

at sbt.inc.Incremental$.compile(Incremental.scala:67)

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:152)

at sbt.Compiler$.compile(Compiler.scala:138)

at sbt.Defaults$.sbt$Defaults$$compileIncrementalTaskImpl(Defaults.scala:860)

at sbt.Defaults$$anonfun$compileIncrementalTask$1.apply(Defaults.scala:851)

at sbt.Defaults$$anonfun$compileIncrementalTask$1.apply(Defaults.scala:849)

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] Error while emitting Sample.scala

[error] <error> (of class scala.reflect.internal.Types$ErrorType$)