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NullPointerException with type lambda + match type #20546

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aherlihy opened this issue Jun 10, 2024 · 2 comments · Fixed by #20553
Closed

NullPointerException with type lambda + match type #20546

aherlihy opened this issue Jun 10, 2024 · 2 comments · Fixed by #20553
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@EugeneFlesselle
Labels
area:named-tuples Issues tied to the named tuples feature. area:typer itype:bug itype:crash regression This worked in a previous version but doesn't anymore
Milestone
3.5.1

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@aherlihy
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aherlihy commented Jun 10, 2024 •
edited
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There is very likely some type-level bug in this code, but even so it should probably not crash with a null pointer

Compiler version

3.5.0-RC1-bin-SNAPSHOT-git-b10d64e

Minimized code

package repro

import NamedTuple.{NamedTuple, AnyNamedTuple}

type And[X <: Boolean, Y <: Boolean] <: Boolean = (X, Y) match
  case (true, true) => true
  case _ => false
type AndLambda = [X <: Boolean, Y <: Boolean] =>> And[X, Y]

trait Expr2[Result, Scalar <: Boolean]:
  type StripScalar[E] = E match
    case Expr2[_, s] => s

  type AllScalar[A <: AnyNamedTuple] = Tuple.Fold[Tuple.Map[NamedTuple.DropNames[A], StripScalar], true, AndLambda]

Output (click arrow to expand)

[error] ## Exception when compiling 12 sources to /Users/anna/lamp/tyql/target/scala-3.5.0-RC1-bin-SNAPSHOT/classes
[error] java.lang.NullPointerException: Cannot invoke "dotty.tools.dotc.core.Types$Type.exists()" because the return value of "dotty.tools.dotc.core.Types$Type.underlyingMatchType(dotty.tools.dotc.core.Contexts$Context)" is null
[error] dotty.tools.dotc.core.Types$Type.isMatchAlias(Types.scala:483)
[error] dotty.tools.dotc.core.Types$AppliedType.tryMatchAlias$1(Types.scala:4672)
[error] dotty.tools.dotc.core.Types$AppliedType.tryNormalize(Types.scala:4687)
[error] dotty.tools.dotc.core.Types$LazyRef.tryNormalize(Types.scala:3244)
[error] dotty.tools.dotc.core.Types$Type.normalized(Types.scala:1547)
[error] dotty.tools.dotc.core.Types$.dotty$tools$dotc$core$Types$AppliedType$$_$tryMatchAlias$1$$anonfun$1$$anonfun$1(Types.scala:4675)
[error] scala.collection.immutable.List.map(List.scala:250)
[error] dotty.tools.dotc.core.Types$AppliedType.tryMatchAlias$1$$anonfun$1(Types.scala:4675)
[error] dotty.tools.dotc.core.MatchTypeTrace$.recurseWith(MatchTypeTrace.scala:88)
[error] dotty.tools.dotc.core.Types$AppliedType.tryMatchAlias$1(Types.scala:4683)
[error] dotty.tools.dotc.core.Types$AppliedType.tryNormalize(Types.scala:4687)
[error] dotty.tools.dotc.core.Types$Type.normalized(Types.scala:1547)
[error] dotty.tools.dotc.core.TypeApplications$.tryReduce$1(TypeApplications.scala:396)
[error] dotty.tools.dotc.core.TypeApplications$.appliedTo$extension(TypeApplications.scala:418)
[error] dotty.tools.dotc.core.Types$AppliedType.derivedAppliedType(Types.scala:4734)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$.mapArgs$2(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$.mapArgs$2(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOverLambda(Types.scala:6230)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:6261)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:163)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] scala.collection.immutable.List.mapConserve(List.scala:472)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:6339)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:163)
[error] dotty.tools.dotc.core.Types$Type.substParams(Types.scala:1927)
[error] dotty.tools.dotc.core.Types$LambdaType.instantiate(Types.scala:3879)
[error] dotty.tools.dotc.core.Types$LambdaType.instantiate$(Types.scala:3840)
[error] dotty.tools.dotc.core.Types$HKLambda.instantiate(Types.scala:3917)
[error] dotty.tools.dotc.core.TypeApplications$.tryReduce$1(TypeApplications.scala:395)
[error] dotty.tools.dotc.core.TypeApplications$.appliedTo$extension(TypeApplications.scala:418)
[error] dotty.tools.dotc.core.TypeApplications$.applyIfParameterized$extension(TypeApplications.scala:444)
[error] dotty.tools.dotc.core.Types$AppliedType.superType(Types.scala:4637)
[error] dotty.tools.dotc.core.Types$AppliedType.underlyingMatchType(Types.scala:4666)
[error] dotty.tools.dotc.core.Types$Type.isMatchAlias(Types.scala:483)
[error] dotty.tools.dotc.core.Types$AppliedType.tryMatchAlias$1(Types.scala:4672)
[error] dotty.tools.dotc.core.Types$AppliedType.tryNormalize(Types.scala:4687)
[error] dotty.tools.dotc.core.Types$LazyRef.tryNormalize(Types.scala:3244)
[error] dotty.tools.dotc.core.Types$Type.normalized(Types.scala:1547)
[error] dotty.tools.dotc.core.Types$.dotty$tools$dotc$core$Types$AppliedType$$_$tryMatchAlias$1$$anonfun$1$$anonfun$1(Types.scala:4675)
[error] scala.collection.immutable.List.map(List.scala:250)
[error] dotty.tools.dotc.core.Types$AppliedType.tryMatchAlias$1$$anonfun$1(Types.scala:4675)
[error] dotty.tools.dotc.core.MatchTypeTrace$.recurseWith(MatchTypeTrace.scala:88)
[error] dotty.tools.dotc.core.Types$AppliedType.tryMatchAlias$1(Types.scala:4683)
[error] dotty.tools.dotc.core.Types$AppliedType.tryNormalize(Types.scala:4687)
[error] dotty.tools.dotc.core.Types$Type.normalized(Types.scala:1547)
[error] dotty.tools.dotc.core.TypeApplications$.tryReduce$1(TypeApplications.scala:396)
[error] dotty.tools.dotc.core.TypeApplications$.appliedTo$extension(TypeApplications.scala:418)
[error] dotty.tools.dotc.core.Types$AppliedType.derivedAppliedType(Types.scala:4734)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$.mapArgs$2(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$.mapArgs$2(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:160)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOverLambda(Types.scala:6230)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:6261)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:163)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] dotty.tools.dotc.core.Substituters$SubstParamsMap.apply(Substituters.scala:201)
[error] scala.collection.immutable.List.mapConserve(List.scala:472)
[error] dotty.tools.dotc.core.Types$TypeMap.mapOver(Types.scala:6339)
[error] dotty.tools.dotc.core.Substituters$.substParams(Substituters.scala:163)
[error] dotty.tools.dotc.core.Types$Type.substParams(Types.scala:1927)
[error] dotty.tools.dotc.core.Types$LambdaType.instantiate(Types.scala:3879)
[error] dotty.tools.dotc.core.Types$LambdaType.instantiate$(Types.scala:3840)
[error] dotty.tools.dotc.core.Types$HKLambda.instantiate(Types.scala:3917)
[error] dotty.tools.dotc.core.TypeApplications$.tryReduce$1(TypeApplications.scala:395)
[error] dotty.tools.dotc.core.TypeApplications$.appliedTo$extension(TypeApplications.scala:418)
[error] dotty.tools.dotc.core.TypeApplications$.applyIfParameterized$extension(TypeApplications.scala:444)
[error] dotty.tools.dotc.core.Types$AppliedType.superType(Types.scala:4637)
[error] dotty.tools.dotc.core.Types$AppliedType.underlyingMatchType(Types.scala:4666)
[error] dotty.tools.dotc.core.Types$Type.isMatchAlias(Types.scala:483)
[error] dotty.tools.dotc.core.TypeOps$.simplify(TypeOps.scala:146)
[error] dotty.tools.dotc.core.Types$Type.simplified(Types.scala:2106)
[error] dotty.tools.dotc.typer.Typer.simplify(Typer.scala:3503)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3487)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3561)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3565)
[error] dotty.tools.dotc.typer.Typer.typedType(Typer.scala:3679)
[error] dotty.tools.dotc.typer.Namer.typedAheadType$$anonfun$1(Namer.scala:1744)
[error] dotty.tools.dotc.typer.Namer.typedAhead(Namer.scala:1737)
[error] dotty.tools.dotc.typer.Namer.typedAheadType(Namer.scala:1744)
[error] dotty.tools.dotc.typer.Namer$TypeDefCompleter.typeSig(Namer.scala:1073)
[error] dotty.tools.dotc.typer.Namer$Completer.completeInCreationContext(Namer.scala:974)
[error] dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:850)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:175)
[error] dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:190)
[error] dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:192)
[error] dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:393)
[error] dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:3346)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3371)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3483)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3561)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3565)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3587)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3633)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:3081)
[error] dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$1(Typer.scala:3387)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:3391)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3483)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3561)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3565)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:3587)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:3633)
[error] dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:3214)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:3433)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:3484)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3561)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:3565)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:3676)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck$$anonfun$1(TyperPhase.scala:47)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] dotty.tools.dotc.core.Phases$Phase.monitor(Phases.scala:503)
[error] dotty.tools.dotc.typer.TyperPhase.typeCheck(TyperPhase.scala:53)
[error] dotty.tools.dotc.typer.TyperPhase.$anonfun$4(TyperPhase.scala:99)
[error] scala.collection.Iterator$$anon$6.hasNext(Iterator.scala:479)
[error] scala.collection.Iterator$$anon$9.hasNext(Iterator.scala:583)
[error] scala.collection.immutable.List.prependedAll(List.scala:152)
[error] scala.collection.immutable.List$.from(List.scala:684)
[error] scala.collection.immutable.List$.from(List.scala:681)
[error] scala.collection.IterableOps$WithFilter.map(Iterable.scala:898)
[error] dotty.tools.dotc.typer.TyperPhase.runOn(TyperPhase.scala:98)
[error] dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:343)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
[error] dotty.tools.dotc.Run.runPhases$1(Run.scala:336)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:384)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:396)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:69)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:396)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:282)
[error] dotty.tools.dotc.Run.compile(Run.scala:267)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:37)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:141)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:180)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:178)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:464)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:419)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:406)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:172)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2371)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2321)
[error] sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:31)
[error] sbt.internal.io.Retry$.apply(Retry.scala:47)
[error] sbt.internal.io.Retry$.apply(Retry.scala:29)
[error] sbt.internal.io.Retry$.apply(Retry.scala:24)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2319)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:63)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:69)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:283)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
[error] sbt.Execute.work(Execute.scala:292)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:283)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:65)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[error] java.base/java.lang.Thread.run(Thread.java:833)
[error]
[error] stack trace is suppressed; run last Compile / compileIncremental for the full output
[error] (Compile / compileIncremental) java.lang.NullPointerException: Cannot invoke "dotty.tools.dotc.core.Types$Type.exists()" because the return value of "dotty.tools.dotc.core.Types$Type.underlyingMatchType(dotty.tools.dotc.core.Contexts$Context)" is null
[error] Total time: 0 s, completed Jun 10, 2024, 7:12:32 PM```
</details>
@aherlihy aherlihy added itype:bug itype:crash stat:needs triage Every issue needs to have an "area" and "itype" label labels Jun 10, 2024
@noti0na1
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noti0na1 commented Jun 10, 2024 •
edited
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Interesting, 3.4, 3.5.0-RC1, and 3.5.nightly actually produce different errors:

  • 3.4 and 3.3 produce a compiling error of "Recursion limit exceeded" due to potential illegal cyclic reference.
  • 3.5.0 has NPE at the result of underlyingMatchType
  • 3.5.1 nightly has NPE at the result of AppliedType.superType of underlyingMatchType

I saw some commits around #19871, may related to cachedSuper and cachedUnderlyingMatch I guess?

cc @EugeneFlesselle

@Gedochao Gedochao added area:typer regression This worked in a previous version but doesn't anymore and removed stat:needs triage Every issue needs to have an "area" and "itype" label labels Jun 11, 2024
@Gedochao
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Last non-crashing stable version: 3.4.2
Last non-crashing nightly: 3.5.0-RC1-bin-20240405-85672a0-NIGHTLY
First crashing nightly: 3.5.0-RC1-bin-20240408-1e8a653-NIGHTLY
Breaks for 3.5.1-RC1 and 3.5.1-RC1-bin-20240607-04ada79-NIGHTLY / current main branch, too.

IMO we should treat it as a regression.

@Gedochao Gedochao added the area:named-tuples Issues tied to the named tuples feature. label Jun 11, 2024
@EugeneFlesselle EugeneFlesselle self-assigned this Jun 11, 2024
EugeneFlesselle added a commit to dotty-staging/dotty that referenced this issue Jun 11, 2024
@EugeneFlesselle
Only set AppliedType#validSuper after AppliedType#cachedSuper
26874bd 
since cycles are possible when computing `AppliedType#superType`,
see tests/neg/i20546.scala for an example leading to an NPE.

We could use `ctx.period == validSuper && cachedSuper == null` as condition to detect cycles,
but they are already handled in `TypeApplications#appliedTo`, with a better error message.

We can update `AppliedType#validSuper` only after the computation is done to fix scala#20546
@EugeneFlesselle EugeneFlesselle mentioned this issue Jun 11, 2024
Merged
EugeneFlesselle added a commit that referenced this issue Jun 11, 2024
@EugeneFlesselle
Only set AppliedType#validSuper after AppliedType#cachedSuper
e2dfea3 
since cycles are possible when computing `AppliedType#superType`,
see tests/neg/i20546.scala for an example leading to an NPE.

We could use `ctx.period == validSuper && cachedSuper == null` as condition to detect cycles,
but they are already handled in `TypeApplications#appliedTo`, with a better error message.

We can update `AppliedType#validSuper` only after the computation is done to fix #20546
@Kordyjan Kordyjan added this to the 3.5.1 milestone Jul 3, 2024
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@EugeneFlesselle EugeneFlesselle

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area:named-tuples Issues tied to the named tuples feature. area:typer itype:bug itype:crash regression This worked in a previous version but doesn't anymore
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Only set AppliedType#validSuper after AppliedType#cachedSuper dotty-staging/dotty
5 participants
@aherlihy @noti0na1 @Kordyjan @Gedochao @EugeneFlesselle