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Compiler AssertionError during refchecks involving block expression and unapplied method conversion #9745

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scabug opened this issue Apr 9, 2016 · 5 comments
Closed

Compiler AssertionError during refchecks involving block expression and unapplied method conversion #9745

scabug opened this issue Apr 9, 2016 · 5 comments
Assignees
@adriaanm
Labels
backend compiler crash has PR minimized
Milestone
2.12.8

Comments

@scabug
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scabug commented Apr 9, 2016 •
edited by retronym

This works:

class Foo {
  var i = 0
  val func = Seq { i = i + 1; i } apply _
  val func2 = Seq { i += 1; i } apply (_: Int)
}

This crashes the compiler:

class Foo {
  var i = 0
  val func = Seq { i += 1; i } apply _
}

This affects both 2.12.0-M4 and 2.11.8.

error: java.lang.AssertionError: assertion failed:
  transformCaseApply: name = i tree = i / class scala.reflect.internal.Trees$Ident
     while compiling: foo.scala
        during phase: refchecks
     library version: version 2.12.0-M4
    compiler version: version 2.12.0-M4
  reconstructed args:

  last tree to typer: This(class Foo)
       tree position: line 3 of foo.scala
            tree tpe: Foo.this.type
              symbol: class Foo
   symbol definition: class Foo extends AnyRef (a ClassSymbol)
      symbol package: <empty>
       symbol owners: class Foo
           call site: class Foo in package <empty>

== Source file context for tree position ==

     0 class Foo {
     1   var i = 0
     2   val func = Seq { i += 1; i } apply _
     3 }
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1753)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1349)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1351)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1263)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.scala$tools$nsc$typechecker$RefChecks$RefCheckTransformer$$$anonfun$83(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer$$Lambda$521/712609105.apply(Unknown Source)
	at scala.collection.immutable.List.flatMap(List.scala:322)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1370)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.api.Trees$Transformer.scala$reflect$api$Trees$Transformer$$$anonfun$6(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1351)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1349)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1351)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$36(Trees.scala:1383)
	at scala.reflect.internal.Trees$$Lambda$507/1164440413.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1383)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$34(Trees.scala:1361)
	at scala.reflect.internal.Trees$$Lambda$506/771775563.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1360)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1251)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.scala$tools$nsc$typechecker$RefChecks$RefCheckTransformer$$$anonfun$83(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer$$Lambda$521/712609105.apply(Unknown Source)
	at scala.collection.immutable.List.flatMap(List.scala:322)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1408)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.api.Trees$Transformer.transformTemplate(Trees.scala:2563)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$37(Trees.scala:1412)
	at scala.reflect.internal.Trees$$Lambda$502/2087885397.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1411)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1263)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.scala$tools$nsc$typechecker$RefChecks$RefCheckTransformer$$$anonfun$83(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer$$Lambda$521/712609105.apply(Unknown Source)
	at scala.collection.immutable.List.flatMap(List.scala:322)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:115)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$40(Trees.scala:1430)
	at scala.reflect.internal.Trees$$Lambda$501/1961173763.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1430)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:140)
	at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)
	at scala.tools.nsc.Global$GlobalPhase.scala$tools$nsc$Global$GlobalPhase$$$anonfun$11(Global.scala:412)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:403)
	at scala.tools.nsc.Global$GlobalPhase.scala$tools$nsc$Global$GlobalPhase$$$anonfun$10(Global.scala:379)
	at scala.tools.nsc.Global$GlobalPhase.scala$tools$nsc$Global$GlobalPhase$$$anonfun$10$adapted(Global.scala:379)
	at scala.tools.nsc.Global$GlobalPhase$$Lambda$259/1068934215.apply(Unknown Source)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1409)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:379)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1483)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1468)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1463)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1557)
	at scala.tools.nsc.MainClass.doCompile(Main.scala:24)
	at scala.tools.nsc.Driver.process(Driver.scala:55)
	at scala.tools.nsc.Driver.main(Driver.scala:68)
	at scala.tools.nsc.Main.main(Main.scala)
Exception in thread "main" java.lang.AssertionError: assertion failed: 
  transformCaseApply: name = i tree = i / class scala.reflect.internal.Trees$Ident
     while compiling: foo.scala
        during phase: refchecks
     library version: version 2.12.0-M4
    compiler version: version 2.12.0-M4
  reconstructed args: 

  last tree to typer: This(class Foo)
       tree position: line 3 of foo.scala
            tree tpe: Foo.this.type
              symbol: class Foo
   symbol definition: class Foo extends AnyRef (a ClassSymbol)
      symbol package: <empty>
       symbol owners: class Foo
           call site: class Foo in package <empty>

== Source file context for tree position ==

     0 class Foo {
     1   var i = 0
     2   val func = Seq { i += 1; i } apply _
     3 }
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1753)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1349)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1351)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1263)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.scala$tools$nsc$typechecker$RefChecks$RefCheckTransformer$$$anonfun$83(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer$$Lambda$521/712609105.apply(Unknown Source)
	at scala.collection.immutable.List.flatMap(List.scala:322)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1370)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.api.Trees$Transformer.scala$reflect$api$Trees$Transformer$$$anonfun$6(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1351)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1349)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1351)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$36(Trees.scala:1383)
	at scala.reflect.internal.Trees$$Lambda$507/1164440413.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1383)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$34(Trees.scala:1361)
	at scala.reflect.internal.Trees$$Lambda$506/771775563.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1360)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1251)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.scala$tools$nsc$typechecker$RefChecks$RefCheckTransformer$$$anonfun$83(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer$$Lambda$521/712609105.apply(Unknown Source)
	at scala.collection.immutable.List.flatMap(List.scala:322)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:115)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1408)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.reflect.api.Trees$Transformer.transformTemplate(Trees.scala:2563)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$37(Trees.scala:1412)
	at scala.reflect.internal.Trees$$Lambda$502/2087885397.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1411)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStat(RefChecks.scala:1263)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.scala$tools$nsc$typechecker$RefChecks$RefCheckTransformer$$$anonfun$83(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer$$Lambda$521/712609105.apply(Unknown Source)
	at scala.collection.immutable.List.flatMap(List.scala:322)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:1171)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transformStats(RefChecks.scala:115)
	at scala.reflect.internal.Trees.scala$reflect$internal$Trees$$$anonfun$40(Trees.scala:1430)
	at scala.reflect.internal.Trees$$Lambda$501/1961173763.apply(Unknown Source)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees.itransform(Trees.scala:1430)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:1800)
	at scala.tools.nsc.typechecker.RefChecks$RefCheckTransformer.transform(RefChecks.scala:115)
	at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:140)
	at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)
	at scala.tools.nsc.Global$GlobalPhase.scala$tools$nsc$Global$GlobalPhase$$$anonfun$11(Global.scala:412)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:403)
	at scala.tools.nsc.Global$GlobalPhase.scala$tools$nsc$Global$GlobalPhase$$$anonfun$10(Global.scala:379)
	at scala.tools.nsc.Global$GlobalPhase.scala$tools$nsc$Global$GlobalPhase$$$anonfun$10$adapted(Global.scala:379)
	at scala.tools.nsc.Global$GlobalPhase$$Lambda$259/1068934215.apply(Unknown Source)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1409)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:379)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1483)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1468)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1463)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1557)
	at scala.tools.nsc.MainClass.doCompile(Main.scala:24)
	at scala.tools.nsc.Driver.process(Driver.scala:55)
	at scala.tools.nsc.Driver.main(Driver.scala:68)
	at scala.tools.nsc.Main.main(Main.scala)

The following fails with a Bad superClass error in 2.12.0-M4 and with a NullPointerException in 2.11.8:

class Foo {
  val func = Seq { var i = 0; i += 1; i } apply _
}
// 2.12.0-M4
java.lang.AssertionError: assertion failed: Bad superClass for class <error>: <none>
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.setClassInfo(BTypesFromSymbols.scala:340)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.scala$tools$nsc$backend$jvm$BTypesFromSymbols$$$anonfun$4(BTypesFromSymbols.scala:122)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols$$Lambda$754/697460450.apply(Unknown Source)
	at scala.collection.concurrent.TrieMap.getOrElse(TrieMap.scala:631)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.classBTypeFromSymbol(BTypesFromSymbols.scala:114)
	at scala.tools.nsc.backend.jvm.BCodeHelpers$BCInnerClassGen.internalName(BCodeHelpers.scala:598)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.internalName(BCodeSkelBuilder.scala:48)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genCallMethod(BCodeBodyBuilder.scala:1081)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genNormalMethodCall$1(BCodeBodyBuilder.scala:728)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:748)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genStat(BCodeBodyBuilder.scala:88)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.scala$tools$nsc$backend$jvm$BCodeBodyBuilder$PlainBodyBuilder$$$anonfun$29(BCodeBodyBuilder.scala:845)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genBlock(BCodeBodyBuilder.scala:845)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:381)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genArrayValue(BCodeBodyBuilder.scala:773)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:392)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.scala$tools$nsc$backend$jvm$BCodeBodyBuilder$PlainBodyBuilder$$$anonfun$37(BCodeBodyBuilder.scala:968)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadArguments(BCodeBodyBuilder.scala:968)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genNormalMethodCall$1(BCodeBodyBuilder.scala:697)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:748)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.scala$tools$nsc$backend$jvm$BCodeBodyBuilder$PlainBodyBuilder$$$anonfun$37(BCodeBodyBuilder.scala:968)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadArguments(BCodeBodyBuilder.scala:968)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genNormalMethodCall$1(BCodeBodyBuilder.scala:697)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:748)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:264)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadQualifier(BCodeBodyBuilder.scala:933)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genTypeApply$1(BCodeBodyBuilder.scala:567)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:596)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:264)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadQualifier(BCodeBodyBuilder.scala:933)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genNormalMethodCall$1(BCodeBodyBuilder.scala:694)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:748)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:264)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:670)
	at scala.tools.nsc.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:311)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.emitNormalMethodBody$1(BCodeSkelBuilder.scala:596)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genDefDef(BCodeSkelBuilder.scala:628)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:502)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.scala$tools$nsc$backend$jvm$BCodeSkelBuilder$PlainSkelBuilder$$$anonfun$22(BCodeSkelBuilder.scala:504)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:504)
	at scala.tools.nsc.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genPlainClass(BCodeSkelBuilder.scala:115)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.visit(GenBCode.scala:189)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.scala$tools$nsc$backend$jvm$GenBCode$BCodePhase$Worker1$$$anonfun$1(GenBCode.scala:138)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker1.run(GenBCode.scala:138)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.buildAndSendToDisk(GenBCode.scala:375)
	at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.run(GenBCode.scala:344)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1483)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1468)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1463)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1557)
	at scala.tools.nsc.MainClass.doCompile(Main.scala:24)
	at scala.tools.nsc.Driver.process(Driver.scala:55)
	at scala.tools.nsc.Driver.main(Driver.scala:68)
	at scala.tools.nsc.Main.main(Main.scala)
error: Error while emitting foo.scala
assertion failed: Bad superClass for class <error>: <none>
one error found

// 2.11.8
error: java.lang.NullPointerException
	at scala.tools.nsc.transform.Mixin$MixinTransformer.scala$tools$nsc$transform$Mixin$MixinTransformer$$postTransform(Mixin.scala:1154)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$transform$1.apply(Mixin.scala:1261)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$transform$1.apply(Mixin.scala:1261)
	at scala.reflect.internal.SymbolTable.enteringPhase(SymbolTable.scala:235)
	at scala.reflect.internal.SymbolTable.exitingPhase(SymbolTable.scala:256)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1261)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2589)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2587)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2587)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1366)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1448)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1345)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1372)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1345)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$$anonfun$itransform$2.apply(Trees.scala:1363)
	at scala.reflect.internal.Trees$$anonfun$itransform$2.apply(Trees.scala:1361)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1360)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2589)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2587)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2587)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1404)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer.transformTemplate(Trees.scala:2563)
	at scala.reflect.internal.Trees$$anonfun$itransform$4.apply(Trees.scala:1408)
	at scala.reflect.internal.Trees$$anonfun$itransform$4.apply(Trees.scala:1407)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1406)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2589)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2587)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2587)
	at scala.reflect.internal.Trees$$anonfun$itransform$7.apply(Trees.scala:1426)
	at scala.reflect.internal.Trees$$anonfun$itransform$7.apply(Trees.scala:1426)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1425)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:147)
	at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply$mcV$sp(Global.scala:440)
	at scala.tools.nsc.Global$GlobalPhase.withCurrentUnit(Global.scala:431)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:440)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:398)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:398)
	at scala.collection.Iterator$class.foreach(Iterator.scala:893)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:398)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1501)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1486)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1481)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1582)
	at scala.tools.nsc.Driver.doCompile(Driver.scala:32)
	at scala.tools.nsc.MainClass.doCompile(Main.scala:23)
	at scala.tools.nsc.Driver.process(Driver.scala:51)
	at scala.tools.nsc.Driver.main(Driver.scala:64)
	at scala.tools.nsc.Main.main(Main.scala)
Exception in thread "main" java.lang.NullPointerException
	at scala.tools.nsc.transform.Mixin$MixinTransformer.scala$tools$nsc$transform$Mixin$MixinTransformer$$postTransform(Mixin.scala:1154)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$transform$1.apply(Mixin.scala:1261)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$transform$1.apply(Mixin.scala:1261)
	at scala.reflect.internal.SymbolTable.enteringPhase(SymbolTable.scala:235)
	at scala.reflect.internal.SymbolTable.exitingPhase(SymbolTable.scala:256)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1261)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2589)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2587)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2587)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1366)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1448)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1345)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1372)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1345)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2559)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2559)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1347)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.internal.Trees$$anonfun$itransform$2.apply(Trees.scala:1363)
	at scala.reflect.internal.Trees$$anonfun$itransform$2.apply(Trees.scala:1361)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1360)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2589)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2587)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2587)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1404)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer.transformTemplate(Trees.scala:2563)
	at scala.reflect.internal.Trees$$anonfun$itransform$4.apply(Trees.scala:1408)
	at scala.reflect.internal.Trees$$anonfun$itransform$4.apply(Trees.scala:1407)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1406)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2589)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2587)
	at scala.collection.immutable.List.loop$1(List.scala:173)
	at scala.collection.immutable.List.mapConserve(List.scala:189)
	at scala.reflect.api.Trees$Transformer.transformStats(Trees.scala:2587)
	at scala.reflect.internal.Trees$$anonfun$itransform$7.apply(Trees.scala:1426)
	at scala.reflect.internal.Trees$$anonfun$itransform$7.apply(Trees.scala:1426)
	at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2600)
	at scala.reflect.internal.Trees$class.itransform(Trees.scala:1425)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:16)
	at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2555)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1258)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:468)
	at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:147)
	at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply$mcV$sp(Global.scala:440)
	at scala.tools.nsc.Global$GlobalPhase.withCurrentUnit(Global.scala:431)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:440)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:398)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:398)
	at scala.collection.Iterator$class.foreach(Iterator.scala:893)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:398)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1501)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1486)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1481)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1582)
	at scala.tools.nsc.Driver.doCompile(Driver.scala:32)
	at scala.tools.nsc.MainClass.doCompile(Main.scala:23)
	at scala.tools.nsc.Driver.process(Driver.scala:51)
	at scala.tools.nsc.Driver.main(Driver.scala:64)
	at scala.tools.nsc.Main.main(Main.scala)
@scabug
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scabug commented Apr 9, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9745?orig=1
Reporter: M. Liebermuth (mliebermuth)
Affected Versions: 2.11.8, 2.12.0-M4

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scabug commented May 24, 2016

@liff said:
I did some debugging with this and here's a slightly altered test case:

object T9745 {
  var i = 0
  def f(i: Unit)(j: Int): Int = ???
  val g = x => f(i += 1)(x)
}

From what I could understand, the problem is that the typer, when typing the function value in g does these steps:

|    |-- ((x) => f(i.$plus$eq(1))(x)) EXPRmode (site: value g  in T9745) 
|    |    |-- f(i.$plus$eq(1)) : pt=(x$1: ?)? BYVALmode-EXPRmode-FUNmode-POLYmode (silent: value $anonfun in T9745) 
… lots of typing and transform i += 1 to i = i + 1
|    |    |-- f(i.<$plus$eq: error>(1))(x) : pt=Int EXPRmode (site: value $anonfun in T9745) 
… and so forth

where the assignment transformation from the first argument list gets discarded but the error remains in the tree which causes the assignment transformation not to be applied again when doing typing with the second parameter list included.

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scabug commented May 24, 2016

@liff said:
Somewhat dubious PR: scala/scala#5187

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scabug commented Mar 12, 2017

@som-snytt said:
Consider scala/scala#5772 which also ranks high on the dube scale.

@scabug scabug added this to the Backlog milestone Apr 7, 2017
@som-snytt
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Here's a slight alteration to the slightly altered test case, from the forum.

scala> :pa
// Entering paste mode (ctrl-D to finish)

locally {
  var i = 0
  List(1).map(x => i += x) : List[Int]
}

// Exiting paste mode, now interpreting.

warning: an unexpected type representation reached the compiler backend while compiling <pastie>: <error>. If possible, please file a bug on https://github.com/scala/bug/issues.
scala.MatchError: <error> (of class scala.reflect.internal.Types$ErrorType$)
	at scala.tools.nsc.backend.jvm.BTypesFromSymbols.typeToBType(BTypesFromSymbols.scala:220)

A slightly different look with members:

scala> :pa
// Entering paste mode (ctrl-D to finish)

object Test {
  var i = 0
  def f(): List[Int] = List(1).map(x => i += x)
}

// Exiting paste mode, now interpreting.

TRANSFORM: null
TREE: i.<$plus$eq: error>(x)
[snip]
TREE: def f(): List[Int] = scala.collection.immutable.List.apply[Int](1).map[Nothing, List[Nothing]](((x: Int) => i.<$plus$eq: error>(x)))(immutable.this.List.canBuildFrom[Nothing])
[snip]
	at scala.tools.nsc.Global.assert(Global.scala:261)
	at scala.tools.nsc.typechecker.SuperAccessors$SuperAccTransformer.transform(SuperAccessors.scala:387)

@SethTisue SethTisue modified the milestones: Backlog, 2.13.0-RC1 Oct 12, 2018
adriaanm added a commit to adriaanm/scala that referenced this issue Oct 15, 2018
@adriaanm
[backport] Do less in typedFunction after typer
5b94a37 
Do more for typedFunction of eta-expanded method:
keep typed method selection (fix scala/bug#9745, follow up for scala#6007)

Test case taken from original PR.

Backported from 64d4c24
adriaanm added a commit to adriaanm/scala that referenced this issue Oct 15, 2018
@adriaanm
[backport] Do less in typedFunction after typer
9614c3a 
Do more for typedFunction of eta-expanded method:
keep typed method selection (fix scala/bug#9745, follow up for scala#6007)

Test case taken from original PR.

Backported from 64d4c24
@adriaanm adriaanm mentioned this issue Nov 14, 2018
Merged
@adriaanm adriaanm modified the milestones: 2.13.0-RC1, 2.12.8 Nov 14, 2018
@som-snytt som-snytt mentioned this issue Oct 17, 2022
Closed
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