Assertion when recompiling package object containing trait with companion object

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What steps will reproduce the problem?

package object test {
	trait PackageError {
	}
	 
	object PackageError {
	}
}

What is the expected behavior?
No compiler error, or error messages explaining restrictions on package object.

What do you see instead?

Exception in thread "main" java.lang.AssertionError: assertion failed: List(object package$$PackageError, object package$$
PackageError)
        at scala.tools.nsc.symtab.Symbols$$Symbol.suchThat(Symbols.scala:1056)
        at scala.tools.nsc.symtab.Symbols$$Symbol.companionModule0(Symbols.scala:1271)
        at scala.tools.nsc.symtab.Symbols$$Symbol.companionModule(Symbols.scala:1281)
        at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.javaName(GenJVM.scala:1753)
        at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.genClass(GenJVM.scala:189)
        at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase.apply(GenJVM.scala:56)
        at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase$$$$anonfun$$run$$3.apply(GenJVM.scala:52)
        at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase$$$$anonfun$$run$$3.apply(GenJVM.scala:52)
        at scala.collection.mutable.HashMap$$$$anon$$2$$$$anonfun$$foreach$$3.apply(HashMap.scala:89)
        at scala.collection.mutable.HashMap$$$$anon$$2$$$$anonfun$$foreach$$3.apply(HashMap.scala:89)
        at scala.collection.Iterator$$class.foreach(Iterator.scala:631)
        at scala.collection.mutable.HashTable$$$$anon$$1.foreach(HashTable.scala:161)
        at scala.collection.mutable.HashTable$$class.foreachEntry(HashTable.scala:194)
        at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
        at scala.collection.mutable.HashMap$$$$anon$$2.foreach(HashMap.scala:89)
        at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase.run(GenJVM.scala:52)
        at scala.tools.nsc.Global$$Run.compileSources(Global.scala:741)
        at scala.tools.nsc.Global$$Run.compile(Global.scala:822)
        at scala.tools.nsc.Main$$.process(Main.scala:106)
        at scala.tools.nsc.Main$$.main(Main.scala:120)
        at scala.tools.nsc.Main.main(Main.scala)
}

What versions of the following are you using?
Scala: 2.8.1
Java: 1.6.u22
Operating system: Windows 7

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Imported From: https://issues.scala-lang.org/browse/SI-4052?orig=1
Reporter: Trond Olsen (tolsen)

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Trond Olsen (tolsen) said:
Note: source was stored in file named package.scala

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@hubertp said:
Works for me in 2.8.1 and trunk.

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Trond Olsen (tolsen) said:
Replying to [comment:3 plocinic]:

Works for me in 2.8.1 and trunk.
What setup do you use? Maybe this is Windows related?

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@hubertp said:
Linux. I will add the test to our test-suite and see if it fails overnight on windows but I doubt it.

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@hubertp said:
It didn't fail, so it must have been something with your setup. Feel free to reopen if you provide steps to reproduce.

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gerferra said:
I've been able to reproduce this with the following steps:

german@ssl2:~$$ scalac -version
Scala compiler version 2.8.1.r23076-b20100923023203 -- Copyright 2002-2010, LAMP/EPFL
german@ssl2:~$$ mkdir 4052
german@ssl2:~$$ cd 4052/
german@ssl2:~/4052$$ ls
german@ssl2:~/4052$$ echo 'package object test { trait PE {}; object PE {} }' > package.scala
german@ssl2:~/4052$$ ls
package.scala
german@ssl2:~/4052$$ scalac package.scala 
german@ssl2:~/4052$$ ls *
package.scala

test:
package.class  package$$.class  package$$PE.class  package$$PE$$.class
german@ssl2:~/4052$$ scalac package.scala 
Exception in thread "main" java.lang.AssertionError: assertion failed: List(object package$$PE, object package$$PE)
	at scala.tools.nsc.symtab.Symbols$$Symbol.suchThat(Symbols.scala:1054)
	at scala.tools.nsc.symtab.Symbols$$Symbol.companionModule0(Symbols.scala:1269)
	at scala.tools.nsc.symtab.Symbols$$Symbol.companionModule(Symbols.scala:1279)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.javaName(GenJVM.scala:1753)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator$$$$anonfun$$addInnerClasses$$3.apply(GenJVM.scala:563)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator$$$$anonfun$$addInnerClasses$$3.apply(GenJVM.scala:554)
	at scala.collection.LinearSeqOptimized$$class.foreach(LinearSeqOptimized.scala:61)
	at scala.collection.immutable.List.foreach(List.scala:45)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.addInnerClasses(GenJVM.scala:554)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.emitClass(GenJVM.scala:138)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.dumpMirrorClass(GenJVM.scala:926)
	at scala.tools.nsc.backend.jvm.GenJVM$$BytecodeGenerator.genClass(GenJVM.scala:230)
	at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase.apply(GenJVM.scala:56)
	at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase$$$$anonfun$$run$$3.apply(GenJVM.scala:52)
	at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase$$$$anonfun$$run$$3.apply(GenJVM.scala:52)
	at scala.collection.mutable.HashMap$$$$anon$$2$$$$anonfun$$foreach$$3.apply(HashMap.scala:89)
	at scala.collection.mutable.HashMap$$$$anon$$2$$$$anonfun$$foreach$$3.apply(HashMap.scala:89)
	at scala.collection.Iterator$$class.foreach(Iterator.scala:631)
	at scala.collection.mutable.HashTable$$$$anon$$1.foreach(HashTable.scala:161)
	at scala.collection.mutable.HashTable$$class.foreachEntry(HashTable.scala:194)
	at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
	at scala.collection.mutable.HashMap$$$$anon$$2.foreach(HashMap.scala:89)
	at scala.tools.nsc.backend.jvm.GenJVM$$JvmPhase.run(GenJVM.scala:52)
	at scala.tools.nsc.Global$$Run.compileSources(Global.scala:741)
	at scala.tools.nsc.Global$$Run.compile(Global.scala:822)
	at scala.tools.nsc.Main$$.process(Main.scala:106)
	at scala.tools.nsc.Main$$.main(Main.scala:120)
	at scala.tools.nsc.Main.main(Main.scala)

So, apparently only occurs when the folder already exists.

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@paulp said:
Sorry for the trouble, I didn't see this the first time around. It's a duplicate of #3437.