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Compiler Crash - trait method with Symbol parameter and default value #4812

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scabug opened this issue Jul 16, 2011 · 4 comments

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@scabug
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commented Jul 16, 2011

The following source

trait Test1 {
 def m1(sym: Symbol = 'TestSym)
}

crashes the compiler:

uncaught exception during compilation: java.util.NoSuchElementException
error: java.util.NoSuchElementException
	at scala.collection.LinearSeqOptimized$class.last(LinearSeqOptimized.scala:135)
	at scala.collection.immutable.List.last(List.scala:77)
	at scala.tools.nsc.backend.icode.Members$IMethod.lastBlock(Members.scala:159)
	at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.addStaticInit(GenJVM.scala:995)
	at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator$$anonfun$genClass$1.apply(GenJVM.scala:445)
	at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator$$anonfun$genClass$1.apply(GenJVM.scala:445)
[...]
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commented Jul 16, 2011

Imported From: https://issues.scala-lang.org/browse/SI-4812?orig=1
Reporter: John Bruce (scimonkey)
Affected Versions: 2.9.0
Attachments:

  • si-4812.patch (created on Oct 30, 2011 1:41:10 PM UTC, 331 bytes)
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commented Aug 16, 2011

@paulp said:
Feels like default parameters.

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commented Oct 30, 2011

Remo Lemma (coloss) said (edited on Oct 30, 2011 1:42:07 PM UTC):
I investigated this bug, and it seems that there was a problem on how the compiler treats default parameters in abstract methods of traits.
This patch should solve the issue. I tested it with different test cases and of course checked that the test suite still finishes with no problems.

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commented May 19, 2012

@lrytz said (edited on May 19, 2012 12:33:38 PM UTC):
fixed in scala/scala@57967c9

The crash is in CleanUp: It generates a static field & constructor in the interface class (that's wrong) because the "scala.Symbol.apply(...)" code remains in the interface as a default argument. Fixed by removing all default arguments from parameter ValDefs in UnCurry.

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