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Cannot reify recursive functions #5274

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scabug opened this issue Dec 5, 2011 · 2 comments
Closed

Cannot reify recursive functions #5274

scabug opened this issue Dec 5, 2011 · 2 comments
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@scabug scabug commented Dec 5, 2011

import scala.tools.nsc.reporters._
import scala.tools.nsc.Settings
import reflect.runtime.Mirror.ToolBox

object Test extends App {
  val code = scala.reflect.Code.lift{
    def factorial(n: BigInt): BigInt =
      if (n == 0) 1 else n * factorial(n-1)

    val f50 = factorial(50); val f49 = factorial(49)
    println("50! = " + f50)
    println("49! = " + f49)
    println("50!/49! = " + (f50 / f49))
  };

  val reporter = new ConsoleReporter(new Settings)
  val toolbox = new ToolBox(reporter)
  val ttree = toolbox.typeCheck(code.tree)
  toolbox.runExpr(ttree)
}
error: recursive method factorial needs result type
java.lang.ClassNotFoundException: __wrapper$1$
  at scala.tools.nsc.interpreter.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:65)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
  at scala.tools.nsc.interpreter.AbstractFileClassLoader.scala$tools$nsc$util$ScalaClassLoader$$super$loadClass(AbstractFileClassLoader.scala:18)
  at scala.tools.nsc.util.ScalaClassLoader$class.loadClass(ScalaClassLoader.scala:63)
  at scala.tools.nsc.interpreter.AbstractFileClassLoader.loadClass(AbstractFileClassLoader.scala:56)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
  at java.lang.Class.forName0(Native Method)
  at java.lang.Class.forName(Class.java:247)
  at scala.reflect.runtime.ToolBoxes$ToolBox$ToolBoxGlobal.runExpr(ToolBoxes.scala:93)
  at scala.reflect.runtime.ToolBoxes$ToolBox.runExpr(ToolBoxes.scala:162)
  at scala.reflect.runtime.ToolBoxes$ToolBox.runExpr(ToolBoxes.scala:165)
  at Test$delayedInit$body.apply(reify_abstracttypes.scala:19)
  at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
  at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
  at scala.App$$anonfun$main$1.apply(App.scala:61)
  at scala.App$$anonfun$main$1.apply(App.scala:61)
  at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
  at scala.collection.immutable.List.foreach(List.scala:77)
  at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:31)
  at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:42)
  at scala.App$class.main(App.scala:61)
  at Test$.main(reify_abstracttypes.scala:5)
  at Test.main(reify_abstracttypes.scala)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at scala.tools.nsc.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClassLoader.scala:90)
  at scala.tools.nsc.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:38)
  at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:159)
  at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:90)
  at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:159)
  at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:28)
  at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:45)
  at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:35)
  at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:45)
  at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:70)
  at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:92)
  at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:101)
  at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
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@scabug scabug commented Dec 5, 2011

Imported From: https://issues.scala-lang.org/browse/SI-5274?orig=1
Reporter: @xeno-by
Affected Versions: 2.9.2

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@scabug scabug commented Feb 3, 2012

@xeno-by said:
Fixed by scala/scala@d940371

@scabug scabug closed this Feb 3, 2012
@scabug scabug added the reflection label Apr 7, 2017
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