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NullPointerException is thrown when compiling pure trait impl with @varargs def #10059

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scabug opened this issue Nov 15, 2016 · 2 comments
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@scabug
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scabug commented Nov 15, 2016

Following code compiles with 2.11.8, but with 2.12.0 in sbt 0.13.13 NullPointerException is thrown

trait VarargsTest {
  @varargs def apply(l: Double*): Double
}

object VarargsTest {

  object Impl extends VarargsTest {
    override final def apply(l: Double*): Double = throw new UnsupportedOperationException("dummy impl")
  }

}

exception thrown:

java.lang.NullPointerException
        at scala.tools.asm.tree.MethodNode.visitLocalVariable(MethodNode.java:572)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.emitLocalVarScope(BCodeSkelBuilder.scala:719)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.$anonfun$genDefDef$8(BCodeSkelBuilder.scala:629)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.emitNormalMethodBody$1(BCodeSkelBuilder.scala:629)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genDefDef(BCodeSkelBuilder.scala:636)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:507)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.$anonfun$gen$7(BCodeSkelBuilder.scala:512)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:512)
        at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genPlainClass(BCodeSkelBuilder.scala:113)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.visit(GenBCode.scala:190)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.$anonfun$run$1(GenBCode.scala:139)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.run(GenBCode.scala:139)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.buildAndSendToDisk(GenBCode.scala:381)
        at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.run(GenBCode.scala:350)
        at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1404)
        at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1389)
        at scala.tools.nsc.Global$Run.compileSources(Global.scala:1384)
        at scala.tools.nsc.Global$Run.compile(Global.scala:1478)
        ...
@scabug
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scabug commented Nov 15, 2016

Imported From: https://issues.scala-lang.org/browse/SI-10059?orig=1
Reporter: Kirill Plyashkevich (412b)
Affected Versions: 2.12.0

@scabug
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scabug commented Nov 16, 2016

@lrytz said:
scala/scala#5534

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