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OlegYch opened this issue Feb 11, 2020 · 9 comments
Closed

Slow compilation involving LazyList #11883

OlegYch opened this issue Feb 11, 2020 · 9 comments
Milestone
Backlog

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@OlegYch
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OlegYch commented Feb 11, 2020 •
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class Test() {
  private def f: Vector[Vector[Int]] = {
    for {
      _               <- Vector(Vector[Int]())
      a = if (true) Vector[Int]() else LazyList[Int]()
      b     = Vector() ++ a ++ Vector()
    } yield b
  }
}

scalacOptions: -deprecation, -unchecked, -encoding, utf8, -feature, -unchecked, -deprecation, -explaintypes, -encoding, UTF8, -language:_, -Xlint:-unused,_

takes about 30 seconds to compile on scala 2.13.1
probably caused by #10908
@Jasper-M
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Jasper-M commented Feb 11, 2020 •
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This line seems to be sufficient. 😂

scala> if (true) Vector[Int]() else LazyList[Int]()
error: Error while emitting 
UTF8 string too large

Looks like every (sub)expression that uses that value considerably increases compilation time. Yours takes the cake though.

@OlegYch
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OlegYch commented Feb 11, 2020

@Jasper-M i wish it had failed right away and we didn't have tp chase it for three days

@SethTisue SethTisue added this to the 2.13.2 milestone Feb 11, 2020
@SethTisue
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SethTisue commented Feb 11, 2020 •
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thanks Oleg for taking the time to isolate this

@SethTisue SethTisue modified the milestones: 2.13.2, Backlog Feb 11, 2020
@SethTisue
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SethTisue commented Feb 11, 2020 •
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duplicate of #10908

I was tempted to milestone this for 2.13.2 or 2.13.3, but it's totally unclear what a fix might look like. I'll call the team's attention to #10908 and see if anybody has any idea for fixing it

@SethTisue SethTisue mentioned this issue Feb 11, 2020
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@tribbloid
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Does the error message:

Error while emitting 
UTF8 string too large

Always appear if the type become too complex? How can we debug it or see the stacktrace when the error was thrown?

@SethTisue
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SethTisue commented Apr 26, 2021 •
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The UTF8 string too large part comes from ASM; the Error while emitting comes from backend.jvm.CodeGen, which catches the exception coming from ASM. Running with -Ydebug will get you a stack trace. Println debugging and attaching a debugger to the compiler are both possibilities; a pull request improving the diagnostic output when this error occurs would be welcome.

@tribbloid
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Thanks, the -Ydebug feature seems to be broken and causes a new error just by enabling:

java.lang.AssertionError: assertion failed: 
  class Array
     while compiling: /home/peng/git/shapesafe/core/src/main/scala/org/shapesafe/core/util/Constraint.scala
        during phase: jvm
     library version: version 2.13.5
    compiler version: version 2.13.5
  reconstructed args: -bootclasspath /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/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-library/2.13.5/d0df6e78b6ccb0102cb0395bfa8cb806e9e81b61/scala-library-2.13.5.jar -deprecation -feature -unchecked -Wconf:cat=feature:w -Wconf:cat=deprecation:w -Wconf:cat=unchecked:w -Wconf:cat=unchecked:w -Wconf:cat=deprecation:w -Wconf:cat=deprecation:ws -Wconf:cat=feature:ws -Wconf:cat=optimizer:ws -Xlint:poly-implicit-overload -Xlint:option-implicit -classpath /home/peng/git/shapesafe/macro/build/classes/kotlin/main:/home/peng/git/shapesafe/macro/build/classes/java/main:/home/peng/git/shapesafe/macro/build/classes/scala/main:/home/peng/git/shapesafe/graph-commons/build/classes/kotlin/main:/home/peng/git/shapesafe/graph-commons/build/classes/java/main:/home/peng/git/shapesafe/graph-commons/build/classes/scala/main:/home/peng/.gradle/caches/modules-2/files-2.1/eu.timepit/singleton-ops_2.13/0.5.2/684ce1cf4a88a9998ac5fc279545611ee9534e34/singleton-ops_2.13-0.5.2.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.30/d10d1e10f47006ee08162dde039e38ac487de4ac/kotlin-stdlib-1.4.30.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-compiler/2.13.5/89f92380397757b03411693c2a3391e84b79e478/scala-compiler-2.13.5.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-reflect/2.13.5/8dee4d8c5374920f2db2f5f55d9dd6ecd4194cc/scala-reflect-2.13.5.jar:/home/peng/.gradle/caches/modules-2/files-2.1/com.chuusai/shapeless_2.13/2.3.3/61817a5ac96ba59ce20b9073416c57519be40f41/shapeless_2.13-2.3.3.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-library/2.13.5/d0df6e78b6ccb0102cb0395bfa8cb806e9e81b61/scala-library-2.13.5.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.30/bb9a3173350f55732416ee27956ea8f9b81f4dbb/kotlin-stdlib-common-1.4.30.jar:/home/peng/.m2/repository/org/jetbrains/annotations/13.0/annotations-13.0.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.jline/jline/3.19.0/27edf6497c4fac20b63ca4cd8788581ca86cb83e/jline-3.19.0.jar:/home/peng/.m2/repository/net/java/dev/jna/jna/5.3.1/jna-5.3.1.jar:/home/peng/git/shapesafe/core/build/classes/java/main:/home/peng/git/shapesafe/core/build/classes/scala/main -language:higherKinds -Vdebug -Vissue

  last tree to typer: Literal(Constant(util.this.RecordView.type))
       tree position: line 34 of /home/peng/git/shapesafe/core/src/main/scala/org/shapesafe/core/util/RecordView.scala
            tree tpe: Class(classOf[org.shapesafe.core.util.RecordView$])
              symbol: null
           call site: primary constructor package in package class util in package util

== Source file context for tree position ==

    31 
    32 }
    33 
    34 object RecordView {}
    35 
        at scala.reflect.internal.SymbolTable.throwAssertionError(SymbolTable.scala:170)
        at scala.tools.nsc.backend.jvm.BTypesFromSymbols.assertClassNotArray(BTypesFromSymbols.scala:221)
        at scala.tools.nsc.backend.jvm.BTypesFromSymbols.assertClassNotArrayNotPrimitive(BTypesFromSymbols.scala:225)
        at scala.tools.nsc.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:96)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.$anonfun$getGenericSignature$2(BCodeHelpers.scala:673)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.enterReferencedClass$1(BCodeHelpers.scala:673)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.$anonfun$getGenericSignature$3(BCodeHelpers.scala:680)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.$anonfun$getGenericSignature$3$adapted(BCodeHelpers.scala:680)
        at scala.tools.nsc.transform.Erasure.jsig$1(Erasure.scala:302)
        at scala.tools.nsc.transform.Erasure.argSig$1(Erasure.scala:244)
        at scala.tools.nsc.transform.Erasure.$anonfun$javaSig0$7(Erasure.scala:327)
        at scala.tools.nsc.transform.Erasure.$anonfun$javaSig0$7$adapted(Erasure.scala:327)
        at scala.tools.nsc.transform.Erasure.jsig$1(Erasure.scala:327)
        at scala.tools.nsc.transform.Erasure.$anonfun$javaSig0$11(Erasure.scala:275)
        at scala.tools.nsc.transform.Erasure.$anonfun$javaSig0$11$adapted(Erasure.scala:375)
        at scala.tools.nsc.transform.Erasure.jsig$1(Erasure.scala:375)
        at scala.tools.nsc.transform.Erasure.jsig$1(Erasure.scala:275)
        at scala.tools.nsc.transform.Erasure.javaSig0(Erasure.scala:411)
        at scala.tools.nsc.transform.Erasure.$anonfun$javaSig$1(Erasure.scala:218)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.getGenericSignature(BCodeHelpers.scala:680)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.getGenericSignature$(BCodeHelpers.scala:667)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.getGenericSignature(BCodeSkelBuilder.scala:51)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.getGenericSignature(BCodeHelpers.scala:664)
        at scala.tools.nsc.backend.jvm.BCodeHelpers$BCJGenSigGen.getGenericSignature$(BCodeHelpers.scala:662)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.getGenericSignature(BCodeSkelBuilder.scala:51)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.initJMethod(BCodeSkelBuilder.scala:559)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genDefDef(BCodeSkelBuilder.scala:619)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:546)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:548)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genPlainClass(BCodeSkelBuilder.scala:157)
        at scala.tools.nsc.backend.jvm.CodeGen.genClass(CodeGen.scala:76)
        at scala.tools.nsc.backend.jvm.CodeGen.genClassDef$1(CodeGen.scala:40)
        at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$3(CodeGen.scala:60)
        at scala.tools.nsc.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:60)
        at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$2(CodeGen.scala:59)
        at scala.tools.nsc.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:59)
        at scala.tools.nsc.backend.jvm.CodeGen.$anonfun$genUnit$4(CodeGen.scala:65)
        at scala.tools.nsc.backend.jvm.CodeGen.genUnit(CodeGen.scala:65)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.apply(GenBCode.scala:74)
        at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:454)
        at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:401)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.super$run(GenBCode.scala:80)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.$anonfun$run$1(GenBCode.scala:80)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.run(GenBCode.scala:78)
        at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1524)
        at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1508)
        at scala.tools.nsc.Global$Run.compileSources(Global.scala:1500)
        at scala.tools.nsc.Global$Run.compile(Global.scala:1635)
        at xsbt.CachedCompiler0.run(CompilerInterface.scala:153)
        at xsbt.CachedCompiler0.run(CompilerInterface.scala:125)
        at xsbt.CompilerInterface.run(CompilerInterface.scala:39)
        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.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:248)
        at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
        at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
        at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
        at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
        at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
        at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
        at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
        at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
        at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
        at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
        at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
        at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
        at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
        at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
        at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
        at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
        at sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
        at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
        at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
        at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
        at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
        at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
        at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
        at org.gradle.api.internal.tasks.scala.ZincScalaCompiler.execute(ZincScalaCompiler.java:159)
        at org.gradle.api.internal.tasks.scala.ZincScalaCompilerFacade.execute(ZincScalaCompilerFacade.java:47)
        at org.gradle.api.internal.tasks.scala.ZincScalaCompilerFacade.execute(ZincScalaCompilerFacade.java:31)
        at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerWorkAction.execute(AbstractDaemonCompiler.java:135)
        at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)
        at org.gradle.workers.internal.AbstractClassLoaderWorker$1.create(AbstractClassLoaderWorker.java:49)
        at org.gradle.workers.internal.AbstractClassLoaderWorker$1.create(AbstractClassLoaderWorker.java:43)
        at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:97)
        at org.gradle.workers.internal.AbstractClassLoaderWorker.executeInClassLoader(AbstractClassLoaderWorker.java:43)
        at org.gradle.workers.internal.IsolatedClassloaderWorker.run(IsolatedClassloaderWorker.java:49)
        at org.gradle.workers.internal.IsolatedClassloaderWorker.run(IsolatedClassloaderWorker.java:30)
        at org.gradle.workers.internal.WorkerDaemonServer.run(WorkerDaemonServer.java:85)
        at org.gradle.workers.internal.WorkerDaemonServer.run(WorkerDaemonServer.java:55)
        at org.gradle.process.internal.worker.request.WorkerAction$1.call(WorkerAction.java:138)
        at org.gradle.process.internal.worker.child.WorkerLogEventListener.withWorkerLoggingProtocol(WorkerLogEventListener.java:41)
        at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:135)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
        at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
        at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
        at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
        at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
        at java.lang.Thread.run(Thread.java:748)
[Error] : Error while emitting Constraint.scala
assertion failed: 
  class Array
     while compiling: /home/peng/git/shapesafe/core/src/main/scala/org/shapesafe/core/util/Constraint.scala
        during phase: jvm
     library version: version 2.13.5
    compiler version: version 2.13.5
  reconstructed args: -bootclasspath /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/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-library/2.13.5/d0df6e78b6ccb0102cb0395bfa8cb806e9e81b61/scala-library-2.13.5.jar -deprecation -feature -unchecked -Wconf:cat=feature:w -Wconf:cat=deprecation:w -Wconf:cat=unchecked:w -Wconf:cat=unchecked:w -Wconf:cat=deprecation:w -Wconf:cat=deprecation:ws -Wconf:cat=feature:ws -Wconf:cat=optimizer:ws -Xlint:poly-implicit-overload -Xlint:option-implicit -classpath /home/peng/git/shapesafe/macro/build/classes/kotlin/main:/home/peng/git/shapesafe/macro/build/classes/java/main:/home/peng/git/shapesafe/macro/build/classes/scala/main:/home/peng/git/shapesafe/graph-commons/build/classes/kotlin/main:/home/peng/git/shapesafe/graph-commons/build/classes/java/main:/home/peng/git/shapesafe/graph-commons/build/classes/scala/main:/home/peng/.gradle/caches/modules-2/files-2.1/eu.timepit/singleton-ops_2.13/0.5.2/684ce1cf4a88a9998ac5fc279545611ee9534e34/singleton-ops_2.13-0.5.2.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.30/d10d1e10f47006ee08162dde039e38ac487de4ac/kotlin-stdlib-1.4.30.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-compiler/2.13.5/89f92380397757b03411693c2a3391e84b79e478/scala-compiler-2.13.5.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-reflect/2.13.5/8dee4d8c5374920f2db2f5f55d9dd6ecd4194cc/scala-reflect-2.13.5.jar:/home/peng/.gradle/caches/modules-2/files-2.1/com.chuusai/shapeless_2.13/2.3.3/61817a5ac96ba59ce20b9073416c57519be40f41/shapeless_2.13-2.3.3.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-library/2.13.5/d0df6e78b6ccb0102cb0395bfa8cb806e9e81b61/scala-library-2.13.5.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.30/bb9a3173350f55732416ee27956ea8f9b81f4dbb/kotlin-stdlib-common-1.4.30.jar:/home/peng/.m2/repository/org/jetbrains/annotations/13.0/annotations-13.0.jar:/home/peng/.gradle/caches/modules-2/files-2.1/org.jline/jline/3.19.0/27edf6497c4fac20b63ca4cd8788581ca86cb83e/jline-3.19.0.jar:/home/peng/.m2/repository/net/java/dev/jna/jna/5.3.1/jna-5.3.1.jar:/home/peng/git/shapesafe/core/build/classes/java/main:/home/peng/git/shapesafe/core/build/classes/scala/main -language:higherKinds -Vdebug -Vissue

  last tree to typer: Literal(Constant(util.this.RecordView.type))
       tree position: line 34 of /home/peng/git/shapesafe/core/src/main/scala/org/shapesafe/core/util/RecordView.scala
            tree tpe: Class(classOf[org.shapesafe.core.util.RecordView$])
              symbol: null
           call site: primary constructor package in package class util in package util

== Source file context for tree position ==

    31 
    32 }
    33 
    34 object RecordView {}
    35 
100 warnings found
one error found

@tribbloid
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In the mean time, the argument "-debug" seems to be missing from the canonical documentation:

https://docs.scala-lang.org/overviews/compiler-options/index.html

It may be experimental

@som-snytt
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@tribbloid that assert was just removed by scala/scala#9583

For the option, see -Vdebug or -Ydebug under Verbose.

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@SethTisue @OlegYch @som-snytt @tribbloid @Jasper-M