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@drdozer
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import scala.language.higherKinds
trait LogDSL[L]
object LogDSL {
implicit object LogRecsLogDSL extends LogDSL[String]
def runLog(ls: String): String = ???
}
trait Direction[D] {
def north: D
}
object Direction {
// needs both instances to trigger the bug
implicit def logDirection[L](implicit L: LogDSL[L]): Direction[L] = ???
implicit def RotateDirection[D](implicit D: Direction[D]): Direction[Rotate.Rotation[D]] = ???
}
trait Rotate[R] {
def rotate(r: R): R
}
object Rotate {
implicit def logRotate[L](implicit L: LogDSL[L]): Rotate[L] = ???
opaque type Rotation[T] = Int => T
}
object Main {
// the instances have to be acquired through implicit resolution to cause the crash
def north[D](implicit D: Direction[D]): D = ???
def rotate[R](r: R)(implicit RR: Rotate[R]): R = ???
def main(args: Array[String]): Unit = {
// commenting out either the first or the second of these lines removes the compiler crash
// removing the wrapping println call abolishes the crash
println(LogDSL.runLog(rotate(north)))
println(LogDSL.runLog(rotate(north)))
}
}
60. Waiting for source changes in project root... (press enter to interrupt)
[info] Compiling 1 Scala source to /home/nmrp3/devel/turingatemyhamster/thirty-min/target/scala-0.13/classes ...
[error] -- Error: /home/nmrp3/devel/turingatemyhamster/thirty-min/src/main/scala/Main.scala:38:11
[error] 38 | println(LogDSL.runLog(rotate(north)))
[error] | ^
[error] |Recursion limit exceeded.
[error] |Maybe there is an illegal cyclic reference?
[error] |If that's not the case, you could also try to increase the stacksize using the -Xss JVM option.
[error] |A recurring operation is (inner to outer):
[error] |
[error] | subtype String <:< D
[error] | subtype LogDSL[String] <:< LogDSL[D]
[error] | subtype LogDSL.LogRecsLogDSL.type <:< LogDSL[D]
[info] exception occurred while typechecking /home/nmrp3/devel/turingatemyhamster/thirty-min/src/main/scala/Main.scala
[info] exception occurred while compiling /home/nmrp3/devel/turingatemyhamster/thirty-min/src/main/scala/Main.scala
dotty.tools.dotc.ast.Trees$UnAssignedTypeException: type of Apply(Select(Ident(LogDSL),runLog),List(Apply(Ident(rotate),List(Ident(north))))) is not assigned while compiling /home/nmrp3/devel/turingatemyhamster/thirty-min/src/main/scala/Main.scala
[error] ## Exception when compiling 1 sources to /home/nmrp3/devel/turingatemyhamster/thirty-min/target/scala-0.13/classes
[error] type of Apply(Select(Ident(LogDSL),runLog),List(Apply(Ident(rotate),List(Ident(north))))) is not assigned
[error] dotty.tools.dotc.ast.Trees$Tree.tpe(Trees.scala:85)
[error] dotty.tools.dotc.ast.TypedTreeInfo.exprPurity(TreeInfo.scala:402)
[error] dotty.tools.dotc.ast.TypedTreeInfo.exprPurity$$anonfun$1(TreeInfo.scala:405)
[error] dotty.tools.dotc.ast.TypedTreeInfo.exprPurity$$anonfun$adapted$1(TreeInfo.scala:405)
[error] scala.collection.immutable.List.map(List.scala:286)
[error] dotty.tools.dotc.ast.TypedTreeInfo.exprPurity(TreeInfo.scala:405)
[error] dotty.tools.dotc.ast.TypedTreeInfo.isPureExpr(TreeInfo.scala:425)
[error] dotty.tools.dotc.typer.Typer.checkStatementPurity(Typer.scala:2817)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2088)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2109)
[error] dotty.tools.dotc.typer.Typer.typedBlockStats(Typer.scala:681)
[error] dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:684)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:1955)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2002)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2120)
[error] dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:1531)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:1935)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2001)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2067)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2109)
[error] dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:1642)
[error] dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:1938)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2001)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2067)
[error] dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2109)
[error] dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:1763)
[error] dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:1980)
[error] dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2002)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2120)
[error] dotty.tools.dotc.typer.FrontEnd.typeCheck$$anonfun$1(FrontEnd.scala:61)
[error] scala.compat.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] dotty.tools.dotc.typer.FrontEnd.monitor(FrontEnd.scala:35)
[error] dotty.tools.dotc.typer.FrontEnd.typeCheck(FrontEnd.scala:65)
[error] dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$2(FrontEnd.scala:89)
[error] scala.compat.java8.JProcedure1.apply(JProcedure1.java:18)
[error] scala.compat.java8.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:392)
[error] dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:89)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:158)
[error] scala.compat.java8.JProcedure1.apply(JProcedure1.java:18)
[error] scala.compat.java8.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
[error] scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
[error] scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:170)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:178)
[error] scala.compat.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:102)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:185)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:120)
[error] dotty.tools.dotc.Run.compile(Run.scala:104)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:33)
[error] dotty.tools.dotc.Driver.process(Driver.scala:166)
[error] xsbt.CachedCompilerImpl.run(CompilerInterface.scala:61)
[error] xsbt.CachedCompilerImpl.run(CompilerInterface.scala:51)
[error] xsbt.CompilerInterface.run(CompilerInterface.scala:35)
[error] jdk.internal.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
[error] java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] java.base/java.lang.reflect.Method.invoke(Method.java:564)
[error] sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
[error] sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
[error] sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
[error] sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
[error] sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
[error] sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1544)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1518)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] sbt.std.Transform$$anon$4.work(System.scala:67)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] sbt.Execute.work(Execute.scala:278)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
[error] java.base/java.lang.Thread.run(Thread.java:844)
[error]
[error] dotty.tools.dotc.ast.Trees$UnAssignedTypeException: type of Apply(Select(Ident(LogDSL),runLog),List(Apply(Ident(rotate),List(Ident(north))))) is not assigned
[error] at dotty.tools.dotc.ast.Trees$Tree.tpe(Trees.scala:85)
[error] at dotty.tools.dotc.ast.TypedTreeInfo.exprPurity(TreeInfo.scala:402)
[error] at dotty.tools.dotc.ast.TypedTreeInfo.exprPurity$$anonfun$1(TreeInfo.scala:405)
[error] at dotty.tools.dotc.ast.TypedTreeInfo.exprPurity$$anonfun$adapted$1(TreeInfo.scala:405)
[error] at scala.collection.immutable.List.map(List.scala:286)
[error] at dotty.tools.dotc.ast.TypedTreeInfo.exprPurity(TreeInfo.scala:405)
[error] at dotty.tools.dotc.ast.TypedTreeInfo.isPureExpr(TreeInfo.scala:425)
[error] at dotty.tools.dotc.typer.Typer.checkStatementPurity(Typer.scala:2817)
[error] at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2088)
[error] at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2109)
[error] at dotty.tools.dotc.typer.Typer.typedBlockStats(Typer.scala:681)
[error] at dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:684)
[error] at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:1955)
[error] at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2002)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2120)
[error] at dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:1531)
[error] at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:1935)
[error] at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2001)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2067)
[error] at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2109)
[error] at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:1642)
[error] at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:1938)
[error] at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2001)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2067)
[error] at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2109)
[error] at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:1763)
[error] at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:1980)
[error] at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2002)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2036)
[error] at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2048)
[error] at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2120)
[error] at dotty.tools.dotc.typer.FrontEnd.typeCheck$$anonfun$1(FrontEnd.scala:61)
[error] at scala.compat.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] at dotty.tools.dotc.typer.FrontEnd.monitor(FrontEnd.scala:35)
[error] at dotty.tools.dotc.typer.FrontEnd.typeCheck(FrontEnd.scala:65)
[error] at dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$2(FrontEnd.scala:89)
[error] at scala.compat.java8.JProcedure1.apply(JProcedure1.java:18)
[error] at scala.compat.java8.JProcedure1.apply(JProcedure1.java:10)
[error] at scala.collection.immutable.List.foreach(List.scala:392)
[error] at dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:89)
[error] at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:158)
[error] at scala.compat.java8.JProcedure1.apply(JProcedure1.java:18)
[error] at scala.compat.java8.JProcedure1.apply(JProcedure1.java:10)
[error] at scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
[error] at scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
[error] at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
[error] at dotty.tools.dotc.Run.runPhases$5(Run.scala:170)
[error] at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:178)
[error] at scala.compat.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:102)
[error] at dotty.tools.dotc.Run.compileUnits(Run.scala:185)
[error] at dotty.tools.dotc.Run.compileSources(Run.scala:120)
[error] at dotty.tools.dotc.Run.compile(Run.scala:104)
[error] at dotty.tools.dotc.Driver.doCompile(Driver.scala:33)
[error] at dotty.tools.dotc.Driver.process(Driver.scala:166)
[error] at xsbt.CachedCompilerImpl.run(CompilerInterface.scala:61)
[error] at xsbt.CachedCompilerImpl.run(CompilerInterface.scala:51)
[error] at xsbt.CompilerInterface.run(CompilerInterface.scala:35)
[error] at jdk.internal.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
[error] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] at java.base/java.lang.reflect.Method.invoke(Method.java:564)
[error] at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
[error] at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
[error] at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
[error] at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
[error] at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
[error] at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
[error] at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
[error] at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
[error] at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
[error] at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
[error] at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
[error] at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
[error] at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
[error] at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
[error] at sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
[error] at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
[error] at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
[error] at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
[error] at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
[error] at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
[error] at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
[error] at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1544)
[error] at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1518)
[error] at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] at sbt.std.Transform$$anon$4.work(System.scala:67)
[error] at sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] at sbt.Execute.work(Execute.scala:278)
[error] at sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
[error] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
[error] at java.base/java.lang.Thread.run(Thread.java:844)
[error] (Compile / compileIncremental) dotty.tools.dotc.ast.Trees$UnAssignedTypeException: type of Apply(Select(Ident(LogDSL),runLog),List(Apply(Ident(rotate),List(Ident(north))))) is not assigned
[error] Total time: 7 s, completed 21 Jan 2019, 15:27:10
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