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empty-selector match in a function body must yield a function #5690

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scabug opened this issue Apr 22, 2012 · 3 comments
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empty-selector match in a function body must yield a function #5690

scabug opened this issue Apr 22, 2012 · 3 comments
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@scabug scabug commented Apr 22, 2012

object PatMatCrash {
  // m.$minus(1)
  // at scala.Predef$.assert(Predef.scala:185)
  // at scala.tools.nsc.Global.assert(Global.scala:187)
  // at scala.tools.nsc.typechecker.SuperAccessors$SuperAccTransformer.transform(SuperAccessors.scala:291)
  val a: (Map[Int, Int] => (Any => Any)) = { m => { case _ => m - 1} }

  // patmat-crash.scala:9: error: erroneous or inaccessible type
  val b: (Int => (Any => Any)) = { m => { case _ => m } }

  // no-symbol does not have an owner (this is a bug: scala version 2.10.0-20120420-170445-56c1f29250)
  // at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:45)
  // at scala.tools.nsc.Global.abort(Global.scala:202)
  // at scala.reflect.internal.Symbols$NoSymbol.owner(Symbols.scala:3031)
  // at scala.tools.nsc.typechecker.SuperAccessors$SuperAccTransformer.hostForAccessorOf(SuperAccessors.scala:474)
  // at scala.tools.nsc.typechecker.SuperAccessors$SuperAccTransformer.needsProtectedAccessor(SuperAccessors.scala:457)
  val c: (Int => (Any => Any)) = { m => { case _ => m.toInt } }
}

// -Xoldpatmat works
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@scabug scabug commented Apr 22, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5690?orig=1
Reporter: @retronym
Affected Versions: 2.10.0
Other Milestones: 2.10.0-M3

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@scabug scabug commented Apr 22, 2012

@retronym said:
In the wild, with workarounds: scalaz/scalaz@180c0ad

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@scabug scabug commented Apr 22, 2012

@retronym said:
By way of contrast, this snippet works:

{ (m: Any) => 0; { case _ => 0 } }: (Any => (Any => Any))

The fun seems to start here:

scala/scala@2848373

@scabug scabug closed this Apr 27, 2012
@scabug scabug added the patmat label Apr 7, 2017
@scabug scabug added this to the 2.10.0-M2 milestone Apr 7, 2017
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