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npe when adapting to implicit method #5578

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scabug opened this Issue Mar 16, 2012 · 3 comments

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scabug commented Mar 16, 2012

trait Base {
  type Rep[T]
}

trait Expressions {
  abstract class Exp[T]
  case class Sym[T](n: Int) extends Exp[T]
  abstract class Def[T]
  def findOrCreateDefinition[T](rhs: Def[T]): Sym[T]
  implicit def toExp[T:Manifest](d: Def[T]): Exp[T] = findOrCreateDefinition(d)
}

trait BaseExp extends Base with Expressions {
  type Rep[T] = Exp[T]

  def findOrCreateDefinition[T](rhs: Def[T]): Sym[T] = null // stub
}

trait NumericOps extends Base {
  def plus[T](x: Rep[T], y: Rep[T]): Rep[T]
}

trait NumericOpsExp extends BaseExp {
  case class Plus[T:Numeric](x: Rep[T], y: Rep[T])
    extends Def[T]

  def plus[T: Numeric](x: Rep[T], y: Rep[T]): Rep[T] = Plus[T](x,y)  

}
  

crashes with

Exception in thread "main" java.lang.NullPointerException
	at scala.tools.nsc.typechecker.Typers$Typer.adapt(Typers.scala:1097)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:4554)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$adaptToImplicitMethod$1$1$$anonfun$apply$29.apply(Typers.scala:790)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$adaptToImplicitMethod$1$1$$anonfun$apply$29.apply(Typers.scala:787)
	at scala.tools.nsc.typechecker.Typers$Typer.silent(Typers.scala:701)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$adaptToImplicitMethod$1$1.apply(Typers.scala:787)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$adaptToImplicitMethod$1$1.apply(Typers.scala:785)
	at scala.tools.nsc.typechecker.Typers$Typer.withCondConstrTyper(Typers.scala:471)
	at scala.tools.nsc.typechecker.Typers$Typer.adaptToImplicitMethod$1(Typers.scala:785)
	at scala.tools.nsc.typechecker.Typers$Typer.adapt(Typers.scala:997)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:4554)
	at scala.tools.nsc.typechecker.Typers$Typer.transformedOrTyped(Typers.scala:4703)
	at scala.tools.nsc.typechecker.Typers$Typer.typedDefDef(Typers.scala:1861)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:4214)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:4545)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStat$1(Typers.scala:2220)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37$$anonfun$38.apply(Typers.scala:2317)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37$$anonfun$38.apply(Typers.scala:2317)
	at scala.collection.immutable.List.loop$1(List.scala:151)
	at scala.collection.immutable.List.mapConserve(List.scala:167)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37.apply(Typers.scala:2317)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37.apply(Typers.scala:2316)
	at scala.tools.nsc.typechecker.Typers$Typer.withSavedContext(Typers.scala:497)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:2316)
	at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:1611)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$26.apply(Typers.scala:1485)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$26.apply(Typers.scala:1485)
	at scala.tools.nsc.typechecker.Typers$Typer.typerReportAnyContextErrors(Typers.scala:488)
	at scala.tools.nsc.typechecker.Typers$Typer.typedClassDef(Typers.scala:1484)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:4205)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:4545)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStat$1(Typers.scala:2220)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37$$anonfun$38.apply(Typers.scala:2317)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37$$anonfun$38.apply(Typers.scala:2317)
	at scala.collection.immutable.List.loop$1(List.scala:151)
	at scala.collection.immutable.List.mapConserve(List.scala:167)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37.apply(Typers.scala:2317)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$37.apply(Typers.scala:2316)
	at scala.tools.nsc.typechecker.Typers$Typer.withSavedContext(Typers.scala:497)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:2316)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:4201)
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scabug commented Mar 16, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5578?orig=1
Reporter: @hubertp
Affected Versions: 2.10.0-M2

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scabug commented Mar 16, 2012

@hubertp said:
It seems that it is a bad interaction with ResetAttrs which side-effects on the tree.

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scabug commented May 3, 2012

@hubertp said:
Fixed in ae5ff6628bb74c16d871a2ada06.

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