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Crash during implicit search with type bounds involved #7509

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scabug opened this issue May 23, 2013 · 3 comments
Closed

Crash during implicit search with type bounds involved #7509

scabug opened this issue May 23, 2013 · 3 comments

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@scabug
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@scabug scabug commented May 23, 2013

Trying to compile:

object MNWE extends App {
  def crash[R <: AnyRef](f: R)(implicit ev: R): Any = ???
  crash(42)
}

Correct behaviour in 2.10.1:

[info] Compiling 1 Scala source to C:\MNWE\target\scala-2.10\classes...
[error] C:\MNWE\src\main\scala\MNWE.scala:3: inferred type arguments [Int] do not conform to method crash's type parameter bounds [R <: AnyRef]
[error]   crash(42)
[error]   ^
[error] C:\MNWE\src\main\scala\MNWE.scala:3: type mismatch;
[error]  found   : Int(42)
[error]  required: R
[error]   crash(42)
[error]         ^
[error] C:\MNWE\src\main\scala\MNWE.scala:3: could not find implicit value for parameter ev: R
[error]   crash(42)
[error]        ^
[error] three errors found

In 2.10.2-RC1: (see Attachment)

MNWE.this.crash[R](42)
	at scala.tools.nsc.typechecker.Typers$Typer.tryNamesDefaults$1(Typers.scala:3273)
	at scala.tools.nsc.typechecker.Typers$Typer.doTypedApply(Typers.scala:3309)
	at scala.tools.nsc.typechecker.Typers$Typer.normalTypedApply$1(Typers.scala:4589)
	at scala.tools.nsc.typechecker.Typers$Typer.typedApply$1(Typers.scala:4621)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5526)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5604)
	at scala.tools.nsc.typechecker.Typers$Typer.adaptToImplicitMethod$1(Typers.scala:870)
	at scala.tools.nsc.typechecker.Typers$Typer.adapt(Typers.scala:1126)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5622)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:2926)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60.apply(Typers.scala:3030)
	at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60.apply(Typers.scala:3030)
	at scala.collection.immutable.List.loop$1(List.scala:170)
	at scala.collection.immutable.List.mapConserve(List.scala:186)
	at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:3030)
	at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:1919)
	at scala.tools.nsc.typechecker.Typers$Typer.typedModuleDef(Typers.scala:1800)
	at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5546)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5604)
	at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:2926)
@scabug
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@scabug scabug commented May 23, 2013

Imported From: https://issues.scala-lang.org/browse/SI-7509?orig=1
Reporter: Raphael Schweizer (rch)
Affected Versions: 2.10.2-RC1, 2.11.0-M3
See #7238
Attachments:

  • Crashlog.txt (created on May 23, 2013 12:24:22 PM UTC, 14065 bytes)

@scabug
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@scabug scabug commented May 23, 2013

@retronym said (edited on May 23, 2013 6:59:20 PM UTC):
Regression is mine: scala/scala@745c36a / #7238

@scabug
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@scabug scabug commented May 23, 2013

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