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Implicit class and method name collision crashes compiler #6335

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scabug opened this issue Sep 7, 2012 · 3 comments
Closed

Implicit class and method name collision crashes compiler #6335

scabug opened this issue Sep 7, 2012 · 3 comments
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@scabug scabug commented Sep 7, 2012

A method with the same name as an implicit class crashes the compiler:

object E {
  def X = 3
  implicit class X(val i: Int) {
    def xx = i
  }
}
error: 
     while compiling: E.scala
        during phase: typer
     library version: version 2.10.0-20120906-172417-b7e08723d1
    compiler version: version 2.10.0-20120906-172417-b7e08723d1
  reconstructed args: -d out

  last tree to typer: Literal(Constant(()))
              symbol: null
   symbol definition: null
                 tpe: Unit
       symbol owners: 
      context owners: class X -> object E -> package <empty>

== Enclosing template or block ==

Template(
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 3 statements
  ValDef( // private[this] val i: <?> in class X
    private <local> <paramaccessor>
    "i"
    "Int"
    <empty>
  )
  DefDef( // def <init>: <?> in class X
    <method>
    "<init>"
    []
    // 1 parameter list
    ValDef(
      <param> <paramaccessor>
      "i"
      "Int"
      <empty>
    )
    <tpt>
    Block(
      Apply(
        super."<init>"
        Nil
      )
      ()
    )
  )
  DefDef( // def xx: <?> in class X
    <method>
    "xx"
    []
    Nil
    <tpt>
    "i"
  )
)

== Expanded type of tree ==

TypeRef(TypeSymbol(final abstract class Unit extends AnyVal))

uncaught exception during compilation: java.lang.AssertionError
error: java.lang.AssertionError: assertion failed: List(method X, method X)
	at scala.Predef$.assert(Predef.scala:173)
	at scala.reflect.internal.Symbols$Symbol.suchThat(Symbols.scala:1562)
	at scala.tools.nsc.typechecker.MethodSynthesis$MethodSynth$ImplicitClassWrapper.derivedSym(MethodSynthesis.scala:380)
	at scala.tools.nsc.typechecker.MethodSynthesis$MethodSynth$class.addDerivedTrees(MethodSynthesis.scala:233)
	at scala.tools.nsc.typechecker.Namers$Namer.addDerivedTrees(Namers.scala:55)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$27.apply(Typers.scala:1788)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$27.apply(Typers.scala:1788)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$rewrappingWrapperTrees$1.apply(Typers.scala:1726)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$rewrappingWrapperTrees$1.apply(Typers.scala:1723)
	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
	at scala.collection.immutable.List.foreach(List.scala:309)
	at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251)
	at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105)
	at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:1788)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$26.apply(Typers.scala:1698)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$26.apply(Typers.scala:1698)
	at scala.tools.nsc.typechecker.Typers$Typer.typerReportAnyContextErrors(Typers.scala:513)
	at scala.tools.nsc.typechecker.Typers$Typer.typedModuleDef(Typers.scala:1697)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5273)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5330)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:2673)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$53.apply(Typers.scala:2767)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$53.apply(Typers.scala:2767)
	at scala.collection.immutable.List.loop$1(List.scala:164)
	at scala.collection.immutable.List.mapConserve(List.scala:180)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:2767)
	at scala.tools.nsc.typechecker.Typers$Typer.typedPackageDef$1(Typers.scala:4999)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5276)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5330)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5381)
	at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.apply(Analyzer.scala:98)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:450)
	at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:90)
	at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:90)
	at scala.collection.Iterator$class.foreach(Iterator.scala:726)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1155)
	at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.run(Analyzer.scala:90)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1561)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1535)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1531)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1641)
	at scala.tools.nsc.Driver.doCompile(Driver.scala:33)
	at scala.tools.nsc.Main$.doCompile(Main.scala:79)
	at scala.tools.nsc.Driver.process(Driver.scala:54)
	at scala.tools.nsc.Driver.main(Driver.scala:67)
	at scala.tools.nsc.Main.main(Main.scala)
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@scabug scabug commented Sep 7, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6335?orig=1
Reporter: @harrah
Affected Versions: 2.10.0-M7, 2.10.0
Other Milestones: 2.10.0

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@scabug scabug commented Sep 9, 2012

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@scabug scabug commented Sep 11, 2012

@gkossakowski said:
Fixed by merging pull request.

@scabug scabug closed this Sep 11, 2012
@scabug scabug added this to the 2.10.0-M7 milestone Apr 7, 2017
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