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scala.reflect.Code.lift on polymorphic functions causes infinite recursion #3566
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Imported From: https://issues.scala-lang.org/browse/SI-3566?orig=1 |
@soc said (edited on Aug 5, 2011 11:31:59 PM UTC): import scala.reflect.Code
def codeOf[A](code: Code[A]) = code codeOf((x: Iterator[A]) => x.sum) results in a StackOverflowError: scala> codeOf((x: Iterable[Int]) => x.head)
java.lang.StackOverflowError
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:57)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:64)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$$anonfun$3.apply(Reifiers.scala:89)
at scala.tools.nsc.transform.Reifiers$$anonfun$3.apply(Reifiers.scala:87)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:197)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:197)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:45)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:197)
at scala.collection.immutable.List.map(List.scala:45)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:87)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$class.mkGlobalSymbol(Reifiers.scala:20)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:38)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:32)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$$anonfun$reify$2.apply(Reifiers.scala:92)
at scala.tools.nsc.transform.Reifiers$$anonfun$reify$2.apply(Reifiers.scala:92)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:197)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:197)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:45)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:197)
at scala.collection.immutable.List.map(List.scala:45)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:92)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$class.mkGlobalSymbol(Reifiers.scala:20)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:38)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$class.reify(Reifiers.scala:32)
at scala.tools.nsc.transform.LiftCode.reify(LiftCode.scala:21)
at scala.tools.nsc.transform.Reifiers$$anonfun$reify$2.apply(Reifiers.scala:92)
at scala.tools.nsc.transform.Reifiers$$anonfun$reify$2.apply(Reifiers.scala:92)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:197)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:197)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:45)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:197)
at scala.collection.immutable.List.map(List.scala:45)
... Replacing the type with an existential does not reify it, but prevents the crash. scala> codeOf((x: Iterable[_]) => null)
could not reify: Iterable[_]
res14: scala.reflect.Code[Iterable[_] => Null] = scala.reflect.Code@3c21251c |
@gkossakowski said: |
@cvogt said: |
@cvogt said: In 2.10 trunk it does not happen anymore. Seems to have been fixed in the reflection overhaul. |
Using Scala version 2.8.0.r22204-b20100614112503 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_20), compiling the following program causes an infinite recursion:
It appears that the recursion occurs during reification of the List[A] type. The stack trace is as follows:
The text was updated successfully, but these errors were encountered: