[info] Compiling 1 Scala source to /home/paul/dev/typelevel/cats/core/.jvm/target/scala-2.12/classes ...
java.lang.AssertionError: assertion failed: Invalid superClass in Lcats/data/package$StateT$;: Some(Lcats/data/StateTFunctions;)
	at scala.tools.nsc.backend.jvm.BTypes$ClassBType.scala$tools$nsc$backend$jvm$BTypes$ClassBType$$checkInfoConsistency(BTypes.scala:649)
	at scala.tools.nsc.backend.jvm.BTypes$ClassBType$.apply(BTypes.scala:817)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:104)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.$anonfun$typeToBType$1(BTypesFromSymbols.scala:158)
	at scala.collection.MapLike.getOrElse(MapLike.scala:128)
	at scala.collection.MapLike.getOrElse$(MapLike.scala:126)
	at scala.collection.AbstractMap.getOrElse(Map.scala:59)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.primitiveOrClassToBType$1(BTypesFromSymbols.scala:158)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.typeToBType(BTypesFromSymbols.scala:173)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.tpeTK(BCodeSkelBuilder.scala:80)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:249)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadQualifier(BCodeBodyBuilder.scala:900)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:664)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:296)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.emitNormalMethodBody$1(BCodeSkelBuilder.scala:602)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genDefDef(BCodeSkelBuilder.scala:634)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:508)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.$anonfun$gen$7(BCodeSkelBuilder.scala:510)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:510)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genPlainClass(BCodeSkelBuilder.scala:110)
	at scala.tools.nsc.backend.jvm.CodeGen.genClass(CodeGen.scala:69)
	at scala.tools.nsc.backend.jvm.CodeGen.genClassDef$1(CodeGen.scala:31)
	at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$3(CodeGen.scala:54)
	at scala.tools.nsc.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:54)
	at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$2(CodeGen.scala:53)
	at scala.tools.nsc.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:53)
	at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$2(CodeGen.scala:53)
	at scala.tools.nsc.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:53)
	at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$4(CodeGen.scala:58)
	at scala.tools.nsc.backend.jvm.CodeGen.genUnit(CodeGen.scala:58)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.apply(GenBCode.scala:67)
	at scala.tools.nsc.Global$GlobalPhase.$anonfun$applyPhase$1(Global.scala:426)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:419)
	at scala.tools.nsc.Global$GlobalPhase.$anonfun$run$1(Global.scala:390)
	at scala.tools.nsc.Global$GlobalPhase.$anonfun$run$1$adapted(Global.scala:390)
	at scala.collection.Iterator.foreach(Iterator.scala:944)
	at scala.collection.Iterator.foreach$(Iterator.scala:944)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1432)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:390)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.super$run(GenBCode.scala:73)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.$anonfun$run$1(GenBCode.scala:73)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.run(GenBCode.scala:71)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1446)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1430)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1423)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1539)
	at xsbt.CachedCompiler0.run(CompilerInterface.scala:130)
	at xsbt.CachedCompiler0.run(CompilerInterface.scala:105)
	at xsbt.CompilerInterface.run(CompilerInterface.scala:31)
	at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
	at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
	at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
	at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
	at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
	at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
	at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
	at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
	at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
	at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
	at sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
	at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
	at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
	at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
	at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
	at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
	at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1544)
	at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1518)
	at scala.Function1.$anonfun$compose$1(Function1.scala:44)
	at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
	at sbt.std.Transform$$anon$4.work(System.scala:67)
	at sbt.Execute.$anonfun$submit$2(Execute.scala:269)
	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
	at sbt.Execute.work(Execute.scala:278)
	at sbt.Execute.$anonfun$submit$1(Execute.scala:269)
	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
	at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
[error] Error while emitting IndexedStateT.scala
[error] assertion failed: Invalid superClass in Lcats/data/package$StateT$;: Some(Lcats/data/StateTFunctions;)