eq in nested object causes crash in genicode

[scabug]

import scala.util.parsing.combinator.syntactical.StandardTokenParsers

trait A {
  object B {
    def eq(lvl: Int): Boolean = true
  }
}

object C extends StandardTokenParsers with A

It still contains StandardTokenParsers as a dependency but I don't have energy to go further - already wasted a lot of time reducing it from some weird and convoluted scala library crash, believe me.

Crash:

error: 
     while compiling: parsersCrash.scala
        during phase: icode
     library version: version 2.10.0-M4
    compiler version: version 2.10.0-M4
  reconstructed args: 

  last tree to typer: term B$module
              symbol: variable A$$B$module in object A$class (flags: <mutable> <synthetic> <modulevar> <expandedname> <notprivate>)
   symbol definition: var A$$B$module: ...
                 tpe: <notype>
       symbol owners: variable A$$B$module -> object A$class -> package <empty>
      context owners: object A$B -> package <empty>

== Enclosing template or block ==

Template( // val <local B>: <notype> in object A$B, tree.tpe=...
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 2 statements
  DefDef( // def eq(lvl: Int): Boolean in object A$B
    <method>
    "eq"
    []
    // 1 parameter list
    ValDef( // lvl: Int
      <param>
      "lvl"
      <tpt> // tree.tpe=Int
      <empty>
    )
    <tpt> // tree.tpe=Boolean
    true
  )
  DefDef( // def <init>(arg$outer: A): ... in object A$B
    <method> <triedcooking>
    "<init>"
    []
    // 1 parameter list
    ValDef( // $outer: A
      <param>
      "$outer"
      <tpt> // tree.tpe=A
      <empty>
    )
    <tpt> // tree.tpe=...
    Block( // tree.tpe=Unit
      Apply( // def <init>(): Object in class Object, tree.tpe=Object
        A$B.super."<init>" // def <init>(): Object in class Object, tree.tpe=()Object
        Nil
      )
      ()
    )
  )
)

== Expanded type of tree ==

<notype>

uncaught exception during compilation: java.lang.AssertionError
error: java.lang.AssertionError: assertion failed: 
     while compiling: parsersCrash.scala
        during phase: icode
     library version: version 2.10.0-M4
    compiler version: version 2.10.0-M4
  reconstructed args: 

  last tree to typer: term B$module
              symbol: variable A$$B$module in object A$class (flags: <mutable> <synthetic> <modulevar> <expandedname> <notprivate>)
   symbol definition: var A$$B$module: ...
                 tpe: <notype>
       symbol owners: variable A$$B$module -> object A$class -> package <empty>
      context owners: object A$B -> package <empty>

== Enclosing template or block ==

Template( // val <local B>: <notype> in object A$B, tree.tpe=...
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 2 statements
  DefDef( // def eq(lvl: Int): Boolean in object A$B
    <method>
    "eq"
    []
    // 1 parameter list
    ValDef( // lvl: Int
      <param>
      "lvl"
      <tpt> // tree.tpe=Int
      <empty>
    )
    <tpt> // tree.tpe=Boolean
    true
  )
  DefDef( // def <init>(arg$outer: A): ... in object A$B
    <method> <triedcooking>
    "<init>"
    []
    // 1 parameter list
    ValDef( // $outer: A
      <param>
      "$outer"
      <tpt> // tree.tpe=A
      <empty>
    )
    <tpt> // tree.tpe=...
    Block( // tree.tpe=Unit
      Apply( // def <init>(): Object in class Object, tree.tpe=Object
        A$B.super."<init>" // def <init>(): Object in class Object, tree.tpe=()Object
        Nil
      )
      ()
    )
  )
)

== Expanded type of tree ==

<notype>

type error: can't convert from REF(class Null) to INT in unit parsersCrash.scala at source-/home/hubert/tmp/toremove/parsersCrash.scala,line-12,offset=158
	at scala.Predef$.assert(Predef.scala:162)
	at scala.tools.nsc.Global.assert(Global.scala:235)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.adapt(GenICode.scala:1125)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1111)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1201)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1199)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadArguments(GenICode.scala:1199)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:905)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.default$2(GenICode.scala:1478)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genCond(GenICode.scala:1521)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadIf(GenICode.scala:358)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:651)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:179)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1023)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genSynchronized$2.apply(GenICode.scala:324)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genSynchronized$2.apply(GenICode.scala:323)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$Context.Try(GenICode.scala:2119)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genSynchronized(GenICode.scala:322)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genPrimitiveOp(GenICode.scala:453)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:884)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:179)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1023)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:179)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1023)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:116)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
	at scala.collection.immutable.List.foreach(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:141)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:91)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
	at scala.collection.immutable.List.foreach(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:82)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:68)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.apply(GenICode.scala:64)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:459)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:426)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:426)
	at scala.collection.Iterator$class.foreach(Iterator.scala:724)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1152)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:426)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.run(GenICode.scala:57)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1574)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1548)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1544)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1654)
	at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
	at scala.tools.nsc.Main$.doCompile(Main.scala:81)
	at scala.tools.nsc.Driver.process(Driver.scala:52)
	at scala.tools.nsc.Driver.main(Driver.scala:65)
	at scala.tools.nsc.Main.main(Main.scala)

Exception in thread "main" java.lang.AssertionError: assertion failed: 
     while compiling: parsersCrash.scala
        during phase: icode
     library version: version 2.10.0-M4
    compiler version: version 2.10.0-M4
  reconstructed args: 

  last tree to typer: term B$module
              symbol: variable A$$B$module in object A$class (flags: <mutable> <synthetic> <modulevar> <expandedname> <notprivate>)
   symbol definition: var A$$B$module: ...
                 tpe: <notype>
       symbol owners: variable A$$B$module -> object A$class -> package <empty>
      context owners: object A$B -> package <empty>

== Enclosing template or block ==

Template( // val <local B>: <notype> in object A$B, tree.tpe=...
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 2 statements
  DefDef( // def eq(lvl: Int): Boolean in object A$B
    <method>
    "eq"
    []
    // 1 parameter list
    ValDef( // lvl: Int
      <param>
      "lvl"
      <tpt> // tree.tpe=Int
      <empty>
    )
    <tpt> // tree.tpe=Boolean
    true
  )
  DefDef( // def <init>(arg$outer: A): ... in object A$B
    <method> <triedcooking>
    "<init>"
    []
    // 1 parameter list
    ValDef( // $outer: A
      <param>
      "$outer"
      <tpt> // tree.tpe=A
      <empty>
    )
    <tpt> // tree.tpe=...
    Block( // tree.tpe=Unit
      Apply( // def <init>(): Object in class Object, tree.tpe=Object
        A$B.super."<init>" // def <init>(): Object in class Object, tree.tpe=()Object
        Nil
      )
      ()
    )
  )
)

== Expanded type of tree ==

<notype>

type error: can't convert from REF(class Null) to INT in unit parsersCrash.scala at source-/home/hubert/tmp/toremove/parsersCrash.scala,line-12,offset=158
	at scala.Predef$.assert(Predef.scala:162)
	at scala.tools.nsc.Global.assert(Global.scala:235)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.adapt(GenICode.scala:1125)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1111)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1201)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1199)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadArguments(GenICode.scala:1199)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:905)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.default$2(GenICode.scala:1478)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genCond(GenICode.scala:1521)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadIf(GenICode.scala:358)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:651)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:179)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1023)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genSynchronized$2.apply(GenICode.scala:324)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genSynchronized$2.apply(GenICode.scala:323)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$Context.Try(GenICode.scala:2119)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genSynchronized(GenICode.scala:322)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genPrimitiveOp(GenICode.scala:453)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:884)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:179)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1023)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:179)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:148)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:148)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1023)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:116)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
	at scala.collection.immutable.List.foreach(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:141)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:91)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:72)
	at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
	at scala.collection.immutable.List.foreach(List.scala:77)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:72)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:82)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:68)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.apply(GenICode.scala:64)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:459)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:426)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:426)
	at scala.collection.Iterator$class.foreach(Iterator.scala:724)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1152)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:426)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.run(GenICode.scala:57)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1574)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1548)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1544)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1654)
	at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
	at scala.tools.nsc.Main$.doCompile(Main.scala:81)
	at scala.tools.nsc.Driver.process(Driver.scala:52)
	at scala.tools.nsc.Driver.main(Driver.scala:65)
	at scala.tools.nsc.Main.main(Main.scala)

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-6072?orig=1
Reporter: @hubertp
Affected Versions: 2.10.0-M4, 2.10.0

[scabug]

@paulp said:
Finishing the gardening:

class A {
  object B { def eq(lvl: Int) = ??? }
}

[scabug]

@paulp said:
scala/scala#914

[scabug]

@hubertp said:
Closed by #914

[scabug]

@adriaanm said:
reopening for 2.10.1-RC1 backport