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compiler crash with trait inside method (part I: add implementation restriction) #6231

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scabug opened this issue Aug 14, 2012 · 7 comments
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@scabug
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@scabug scabug commented Aug 14, 2012

Sorry the summary isn't great; this crashed the compiler, it's as minimized as I could get it from my original encounter.

object Bug {
  def foo[V: Ordered] {}

  def bar[V: Ordered] {
//    object Scope {
      trait X {
        def qux = { i: Any => foo }
      }
//    }
  }
}

causes a compiler crash under both 2.9.2 and 2.10.0-M6. Uncommenting the two commented lines allows us to work around this issue for now.

The output from M6 is:

[info] Compiling 41 Scala sources and 1 Java source to /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes...
[error] No getter for value evidence$2$1 in trait Bug$X$1

     while compiling: /Users/scott/projects/toolkit/algebra/src/main/scala/net/tqft/toolkit/algebra/Bug.scala
        during phase: mixin
     library version: version 2.10.0-M6
    compiler version: version 2.10.0-M6
  reconstructed args: -d /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes -classpath /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/base/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/arithmetic/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/functions/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/collections/target/scala-2.10.0-M6/classes:/Users/scott/.ivy2/cache/org.slf4j/slf4j-log4j12/jars/slf4j-log4j12-1.6.1.jar:/Users/scott/.ivy2/cache/org.slf4j/slf4j-api/jars/slf4j-api-1.6.1.jar:/Users/scott/.ivy2/cache/log4j/log4j/bundles/log4j-1.2.16.jar:/Users/scott/.ivy2/cache/commons-logging/commons-logging/jars/commons-logging-1.1.1.jar:/Users/scott/.ivy2/cache/com.google.guava/guava/jars/guava-12.0.jar:/Users/scott/.ivy2/cache/com.google.code.findbugs/jsr305/jars/jsr305-1.3.9.jar:/Users/scott/.ivy2/cache/org.apache.commons/commons-math/jars/commons-math-2.2.jar:/Users/scott/.ivy2/cache/org.apfloat/apfloat/jars/apfloat-1.6.3.jar -bootclasspath /Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jsfd.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaRuntimeSupport.framework/Resources/Java/JavaRuntimeSupport.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/ui.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/laf.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/sunrsasign.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jsse.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jce.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/charsets.jar:/Users/scott/.sbt/boot/scala-2.10.0-M6/lib/scala-library.jar

  last tree to typer: Ident(positions$1)
              symbol: value positions$1 (flags: <param> <synthetic> <triedcooking>)
   symbol definition: positions$1: scala.collection.immutable.IndexedSeq
                 tpe: scala.collection.immutable.IndexedSeq
       symbol owners: value positions$1 -> constructor Permutations$$anonfun$preserving$1 -> anonymous class Permutations$$anonfun$preserving$1 -> package permutations
      context owners: anonymous class Bug$X$1$$anonfun$qux$1 -> package algebra

== Enclosing template or block ==

Template( // val <local $anonfun>: <notype>, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
  "scala.runtime.AbstractFunction1$mcVL$sp", "scala.Serializable" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 3 statements
  DefDef( // final def apply(x$1: Object): Unit
    <method> final <triedcooking>
    "apply"
    []
    // 1 parameter list
    ValDef( // i: Object
      <param>
      "i"
      <tpt> // tree.tpe=Object
      <empty>
    )
    <tpt> // tree.tpe=Unit
    Apply( // def foo(evidence$1: scala.math.Ordered): Unit in object Bug, tree.tpe=Unit
      Bug.this."foo" // def foo(evidence$1: scala.math.Ordered): Unit in object Bug, tree.tpe=(evidence$1: scala.math.Ordered)Unit
      Bug$X$1$$anonfun$qux$1.this."$outer "."evidence$2$1" // val evidence$2$1: scala.math.Ordered in class Bug$X$1$class, tree.tpe=scala.math.Ordered
    )
  )
  DefDef( // final def apply(v1: Object): Object
    <method> final <bridge>
    "apply"
    []
    // 1 parameter list
    ValDef( // v1: Object
      <param> <triedcooking>
      "v1"
      <tpt> // tree.tpe=Object
      <empty>
    )
    <tpt> // tree.tpe=Object
    Block( // tree.tpe=scala.runtime.BoxedUnit
      Apply( // final def apply(x$1: Object): Unit, tree.tpe=Unit
        Bug$X$1$$anonfun$qux$1.this."apply" // final def apply(x$1: Object): Unit, tree.tpe=(x$1: Object)Unit
        "v1" // v1: Object, tree.tpe=Object
      )
      "scala"."runtime"."BoxedUnit"."UNIT" // final val UNIT: scala.runtime.BoxedUnit in object BoxedUnit, tree.tpe=scala.runtime.BoxedUnit
    )
  )
  DefDef( // def <init>(arg$outer: net.tqft.toolkit.algebra.Bug$X$1): net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
    <method> <triedcooking>
    "<init>"
    []
    // 1 parameter list
    ValDef( // $outer: net.tqft.toolkit.algebra.Bug$X$1
      <param> <triedcooking>
      "$outer"
      <tpt> // tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
      <empty>
    )
    <tpt> // tree.tpe=net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
    Block( // tree.tpe=Unit
      // 2 statements
      If( // tree.tpe=Unit
        Apply( // final def eq(x$1: Object): Boolean in class Object, tree.tpe=Boolean
          "$outer"."eq" // final def eq(x$1: Object): Boolean in class Object, tree.tpe=(x$1: Object)Boolean
          null
        )
        Throw( // tree.tpe=Nothing
          Apply( // def <init>(): NullPointerException in class NullPointerException, tree.tpe=NullPointerException
            new NullPointerException."<init>" // def <init>(): NullPointerException in class NullPointerException, tree.tpe=()NullPointerException
            Nil
          )
        )
        Assign( // tree.tpe=Unit
          Bug$X$1$$anonfun$qux$1.this."$outer " // private[this] val $outer: net.tqft.toolkit.algebra.Bug$X$1, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
          "$outer" // $outer: net.tqft.toolkit.algebra.Bug$X$1, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
        )
      )
      Apply( // def <init>(): scala.runtime.AbstractFunction1$mcVL$sp in class AbstractFunction1$mcVL$sp, tree.tpe=scala.runtime.AbstractFunction1$mcVL$sp
        Bug$X$1$$anonfun$qux$1.super."<init>" // def <init>(): scala.runtime.AbstractFunction1$mcVL$sp in class AbstractFunction1$mcVL$sp, tree.tpe=()scala.runtime.AbstractFunction1$mcVL$sp
        Nil
      )
      ()
    )
  )
)

== Expanded type of tree ==

TypeRef(
  TypeSymbol(
    abstract trait IndexedSeq extends Seq with IndexedSeq with GenericTraversableTemplate with IndexedSeqLike
    
  )
)

unhandled exception while transforming Bug.scala
[error] 
[error]      while compiling: /Users/scott/projects/toolkit/algebra/src/main/scala/net/tqft/toolkit/algebra/Bug.scala
[error]         during phase: mixin
[error]      library version: version 2.10.0-M6
[error]     compiler version: version 2.10.0-M6
[error]   reconstructed args: -d /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes -classpath /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/base/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/arithmetic/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/functions/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/collections/target/scala-2.10.0-M6/classes:/Users/scott/.ivy2/cache/org.slf4j/slf4j-log4j12/jars/slf4j-log4j12-1.6.1.jar:/Users/scott/.ivy2/cache/org.slf4j/slf4j-api/jars/slf4j-api-1.6.1.jar:/Users/scott/.ivy2/cache/log4j/log4j/bundles/log4j-1.2.16.jar:/Users/scott/.ivy2/cache/commons-logging/commons-logging/jars/commons-logging-1.1.1.jar:/Users/scott/.ivy2/cache/com.google.guava/guava/jars/guava-12.0.jar:/Users/scott/.ivy2/cache/com.google.code.findbugs/jsr305/jars/jsr305-1.3.9.jar:/Users/scott/.ivy2/cache/org.apache.commons/commons-math/jars/commons-math-2.2.jar:/Users/scott/.ivy2/cache/org.apfloat/apfloat/jars/apfloat-1.6.3.jar -bootclasspath /Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jsfd.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaRuntimeSupport.framework/Resources/Java/JavaRuntimeSupport.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/ui.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/laf.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/sunrsasign.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jsse.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jce.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/charsets.jar:/Users/scott/.sbt/boot/scala-2.10.0-M6/lib/scala-library.jar
[error] 
[error]   last tree to typer: Ident(positions$1)
[error]               symbol: value positions$1 (flags: <param> <synthetic> <triedcooking>)
[error]    symbol definition: positions$1: scala.collection.immutable.IndexedSeq
[error]                  tpe: scala.collection.immutable.IndexedSeq
[error]        symbol owners: value positions$1 -> constructor Permutations$$anonfun$preserving$1 -> anonymous class Permutations$$anonfun$preserving$1 -> package permutations
[error]       context owners: anonymous class Bug$X$1$$anonfun$qux$1 -> package algebra
[error] 
[error] == Enclosing template or block ==
[error] 
[error] Template( // val <local $anonfun>: <notype>, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
[error]   "scala.runtime.AbstractFunction1$mcVL$sp", "scala.Serializable" // parents
[error]   ValDef(
[error]     private
[error]     "_"
[error]     <tpt>
[error]     <empty>
[error]   )
[error]   // 3 statements
[error]   DefDef( // final def apply(x$1: Object): Unit
[error]     <method> final <triedcooking>
[error]     "apply"
[error]     []
[error]     // 1 parameter list
[error]     ValDef( // i: Object
[error]       <param>
[error]       "i"
[error]       <tpt> // tree.tpe=Object
[error]       <empty>
[error]     )
[error]     <tpt> // tree.tpe=Unit
[error]     Apply( // def foo(evidence$1: scala.math.Ordered): Unit in object Bug, tree.tpe=Unit
[error]       Bug.this."foo" // def foo(evidence$1: scala.math.Ordered): Unit in object Bug, tree.tpe=(evidence$1: scala.math.Ordered)Unit
[error]       Bug$X$1$$anonfun$qux$1.this."$outer "."evidence$2$1" // val evidence$2$1: scala.math.Ordered in class Bug$X$1$class, tree.tpe=scala.math.Ordered
[error]     )
[error]   )
[error]   DefDef( // final def apply(v1: Object): Object
[error]     <method> final <bridge>
[error]     "apply"
[error]     []
[error]     // 1 parameter list
[error]     ValDef( // v1: Object
[error]       <param> <triedcooking>
[error]       "v1"
[error]       <tpt> // tree.tpe=Object
[error]       <empty>
[error]     )
[error]     <tpt> // tree.tpe=Object
[error]     Block( // tree.tpe=scala.runtime.BoxedUnit
[error]       Apply( // final def apply(x$1: Object): Unit, tree.tpe=Unit
[error]         Bug$X$1$$anonfun$qux$1.this."apply" // final def apply(x$1: Object): Unit, tree.tpe=(x$1: Object)Unit
[error]         "v1" // v1: Object, tree.tpe=Object
[error]       )
[error]       "scala"."runtime"."BoxedUnit"."UNIT" // final val UNIT: scala.runtime.BoxedUnit in object BoxedUnit, tree.tpe=scala.runtime.BoxedUnit
[error]     )
[error]   )
[error]   DefDef( // def <init>(arg$outer: net.tqft.toolkit.algebra.Bug$X$1): net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
[error]     <method> <triedcooking>
[error]     "<init>"
[error]     []
[error]     // 1 parameter list
[error]     ValDef( // $outer: net.tqft.toolkit.algebra.Bug$X$1
[error]       <param> <triedcooking>
[error]       "$outer"
[error]       <tpt> // tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
[error]       <empty>
[error]     )
[error]     <tpt> // tree.tpe=net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
[error]     Block( // tree.tpe=Unit
[error]       // 2 statements
[error]       If( // tree.tpe=Unit
[error]         Apply( // final def eq(x$1: Object): Boolean in class Object, tree.tpe=Boolean
[error]           "$outer"."eq" // final def eq(x$1: Object): Boolean in class Object, tree.tpe=(x$1: Object)Boolean
[error]           null
[error]         )
[error]         Throw( // tree.tpe=Nothing
[error]           Apply( // def <init>(): NullPointerException in class NullPointerException, tree.tpe=NullPointerException
[error]             new NullPointerException."<init>" // def <init>(): NullPointerException in class NullPointerException, tree.tpe=()NullPointerException
[error]             Nil
[error]           )
[error]         )
[error]         Assign( // tree.tpe=Unit
[error]           Bug$X$1$$anonfun$qux$1.this."$outer " // private[this] val $outer: net.tqft.toolkit.algebra.Bug$X$1, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
[error]           "$outer" // $outer: net.tqft.toolkit.algebra.Bug$X$1, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
[error]         )
[error]       )
[error]       Apply( // def <init>(): scala.runtime.AbstractFunction1$mcVL$sp in class AbstractFunction1$mcVL$sp, tree.tpe=scala.runtime.AbstractFunction1$mcVL$sp
[error]         Bug$X$1$$anonfun$qux$1.super."<init>" // def <init>(): scala.runtime.AbstractFunction1$mcVL$sp in class AbstractFunction1$mcVL$sp, tree.tpe=()scala.runtime.AbstractFunction1$mcVL$sp
[error]         Nil
[error]       )
[error]       ()
[error]     )
[error]   )
[error] )
[error] 
[error] == Expanded type of tree ==
[error] 
[error] TypeRef(
[error]   TypeSymbol(
[error]     abstract trait IndexedSeq extends Seq with IndexedSeq with GenericTraversableTemplate with IndexedSeqLike
[error]     
[error]   )
[error] )
[error] 
[error] uncaught exception during compilation: scala.reflect.internal.FatalError
[error] {file:/Users/scott/projects/toolkit/}toolkit-algebra/compile:compile: scala.reflect.internal.FatalError: 
[error]      while compiling: /Users/scott/projects/toolkit/algebra/src/main/scala/net/tqft/toolkit/algebra/Bug.scala
[error]         during phase: global=mixin, atPhase=cleanup
[error]      library version: version 2.10.0-M6
[error]     compiler version: version 2.10.0-M6
[error]   reconstructed args: -d /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes -classpath /Users/scott/projects/toolkit/algebra/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/base/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/arithmetic/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/functions/target/scala-2.10.0-M6/classes:/Users/scott/projects/toolkit/collections/target/scala-2.10.0-M6/classes:/Users/scott/.ivy2/cache/org.slf4j/slf4j-log4j12/jars/slf4j-log4j12-1.6.1.jar:/Users/scott/.ivy2/cache/org.slf4j/slf4j-api/jars/slf4j-api-1.6.1.jar:/Users/scott/.ivy2/cache/log4j/log4j/bundles/log4j-1.2.16.jar:/Users/scott/.ivy2/cache/commons-logging/commons-logging/jars/commons-logging-1.1.1.jar:/Users/scott/.ivy2/cache/com.google.guava/guava/jars/guava-12.0.jar:/Users/scott/.ivy2/cache/com.google.code.findbugs/jsr305/jars/jsr305-1.3.9.jar:/Users/scott/.ivy2/cache/org.apache.commons/commons-math/jars/commons-math-2.2.jar:/Users/scott/.ivy2/cache/org.apfloat/apfloat/jars/apfloat-1.6.3.jar -bootclasspath /Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jsfd.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaRuntimeSupport.framework/Resources/Java/JavaRuntimeSupport.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/ui.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/laf.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/sunrsasign.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jsse.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/jce.jar:/Library/Java/JavaVirtualMachines/1.6.0_32-b05-420.jdk/Contents/Classes/charsets.jar:/Users/scott/.sbt/boot/scala-2.10.0-M6/lib/scala-library.jar
[error] 
[error]   last tree to typer: Ident(positions$1)
[error]               symbol: value positions$1 (flags: <param> <synthetic> <triedcooking>)
[error]    symbol definition: positions$1: scala.collection.immutable.IndexedSeq
[error]                  tpe: scala.collection.immutable.IndexedSeq
[error]        symbol owners: value positions$1 -> constructor Permutations$$anonfun$preserving$1 -> anonymous class Permutations$$anonfun$preserving$1 -> package permutations
[error]       context owners: anonymous class Bug$X$1$$anonfun$qux$1 -> package algebra
[error] 
[error] == Enclosing template or block ==
[error] 
[error] Template( // val <local $anonfun>: <notype>, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
[error]   "scala.runtime.AbstractFunction1$mcVL$sp", "scala.Serializable" // parents
[error]   ValDef(
[error]     private
[error]     "_"
[error]     <tpt>
[error]     <empty>
[error]   )
[error]   // 3 statements
[error]   DefDef( // final def apply(x$1: Object): Unit
[error]     <method> final <triedcooking>
[error]     "apply"
[error]     []
[error]     // 1 parameter list
[error]     ValDef( // i: Object
[error]       <param>
[error]       "i"
[error]       <tpt> // tree.tpe=Object
[error]       <empty>
[error]     )
[error]     <tpt> // tree.tpe=Unit
[error]     Apply( // def foo(evidence$1: scala.math.Ordered): Unit in object Bug, tree.tpe=Unit
[error]       Bug.this."foo" // def foo(evidence$1: scala.math.Ordered): Unit in object Bug, tree.tpe=(evidence$1: scala.math.Ordered)Unit
[error]       Bug$X$1$$anonfun$qux$1.this."$outer "."evidence$2$1" // val evidence$2$1: scala.math.Ordered in class Bug$X$1$class, tree.tpe=scala.math.Ordered
[error]     )
[error]   )
[error]   DefDef( // final def apply(v1: Object): Object
[error]     <method> final <bridge>
[error]     "apply"
[error]     []
[error]     // 1 parameter list
[error]     ValDef( // v1: Object
[error]       <param> <triedcooking>
[error]       "v1"
[error]       <tpt> // tree.tpe=Object
[error]       <empty>
[error]     )
[error]     <tpt> // tree.tpe=Object
[error]     Block( // tree.tpe=scala.runtime.BoxedUnit
[error]       Apply( // final def apply(x$1: Object): Unit, tree.tpe=Unit
[error]         Bug$X$1$$anonfun$qux$1.this."apply" // final def apply(x$1: Object): Unit, tree.tpe=(x$1: Object)Unit
[error]         "v1" // v1: Object, tree.tpe=Object
[error]       )
[error]       "scala"."runtime"."BoxedUnit"."UNIT" // final val UNIT: scala.runtime.BoxedUnit in object BoxedUnit, tree.tpe=scala.runtime.BoxedUnit
[error]     )
[error]   )
[error]   DefDef( // def <init>(arg$outer: net.tqft.toolkit.algebra.Bug$X$1): net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
[error]     <method> <triedcooking>
[error]     "<init>"
[error]     []
[error]     // 1 parameter list
[error]     ValDef( // $outer: net.tqft.toolkit.algebra.Bug$X$1
[error]       <param> <triedcooking>
[error]       "$outer"
[error]       <tpt> // tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
[error]       <empty>
[error]     )
[error]     <tpt> // tree.tpe=net.tqft.toolkit.algebra.Bug$X$1$$anonfun$qux$1
[error]     Block( // tree.tpe=Unit
[error]       // 2 statements
[error]       If( // tree.tpe=Unit
[error]         Apply( // final def eq(x$1: Object): Boolean in class Object, tree.tpe=Boolean
[error]           "$outer"."eq" // final def eq(x$1: Object): Boolean in class Object, tree.tpe=(x$1: Object)Boolean
[error]           null
[error]         )
[error]         Throw( // tree.tpe=Nothing
[error]           Apply( // def <init>(): NullPointerException in class NullPointerException, tree.tpe=NullPointerException
[error]             new NullPointerException."<init>" // def <init>(): NullPointerException in class NullPointerException, tree.tpe=()NullPointerException
[error]             Nil
[error]           )
[error]         )
[error]         Assign( // tree.tpe=Unit
[error]           Bug$X$1$$anonfun$qux$1.this."$outer " // private[this] val $outer: net.tqft.toolkit.algebra.Bug$X$1, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
[error]           "$outer" // $outer: net.tqft.toolkit.algebra.Bug$X$1, tree.tpe=net.tqft.toolkit.algebra.Bug$X$1
[error]         )
[error]       )
[error]       Apply( // def <init>(): scala.runtime.AbstractFunction1$mcVL$sp in class AbstractFunction1$mcVL$sp, tree.tpe=scala.runtime.AbstractFunction1$mcVL$sp
[error]         Bug$X$1$$anonfun$qux$1.super."<init>" // def <init>(): scala.runtime.AbstractFunction1$mcVL$sp in class AbstractFunction1$mcVL$sp, tree.tpe=()scala.runtime.AbstractFunction1$mcVL$sp
[error]         Nil
[error]       )
[error]       ()
[error]     )
[error]   )
[error] )
[error] 
[error] == Expanded type of tree ==
[error] 
[error] TypeRef(
[error]   TypeSymbol(
[error]     abstract trait IndexedSeq extends Seq with IndexedSeq with GenericTraversableTemplate with IndexedSeqLike
[error]     
[error]   )
[error] )
[error] 
[error] No getter for value evidence$2$1 in trait Bug$X$1
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@scabug scabug commented Aug 14, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6231?orig=1
Reporter: Scott Morrison (scott)
Affected Versions: 2.9.2, 2.10.0-M6

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@scabug scabug commented Aug 14, 2012

@retronym said:
Cut down:

object Bug {
  def bar(ev: Any) {
    trait X {
      def qux = { () => ev }
    }
  }
}
== Expanded type of tree ==

TypeRef(TypeSymbol(class Object extends ))

No getter for value ev$1 in trait Bug$X$1
	at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:46)
	at scala.tools.nsc.Global.abort(Global.scala:249)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$14.apply(Mixin.scala:1220)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$14.apply(Mixin.scala:1220)
	at scala.reflect.internal.Symbols$Symbol.orElse(Symbols.scala:2080)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.scala$tools$nsc$transform$Mixin$MixinTransformer$$postTransform(Mixin.scala:1220)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$transform$1.apply(Mixin.scala:1248)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$transform$1.apply(Mixin.scala:1248)
	at scala.reflect.internal.SymbolTable.enteringPhase(SymbolTable.scala:195)
	at scala.reflect.internal.SymbolTable.exitingPhase(SymbolTable.scala:199)
	at scala.tools.nsc.Global.exitingMixin(Global.scala:1058)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:1248)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:472)
	at scala.reflect.internal.Trees$$anonfun$itransform$5.apply(Trees.scala:1181)
	at scala.reflect.internal.Trees$$anonfun$itransform$5.apply(Trees.scala:1179)

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@scabug scabug commented Jan 20, 2013

@retronym said:

        case Select(qual, name) if sym.owner.isImplClass && !isStaticOnly(sym) =>
          assert(!sym.isMethod, "no method allowed here: %s%s %s".format(sym, sym.isImplOnly, flagsToString(sym.flags)))
          // refer to fields in some implementation class via an abstract
          // getter in the interface.
          val iface  = toInterface(sym.owner.tpe).typeSymbol
          val getter = sym getter iface orElse abort("No getter for " + sym + " in " + iface)

          typedPos(tree.pos)((qual DOT getter)())

sym.owner.tpe (the trait implementation class) contains the a member, ev$1, but this isn't reflected in the trait interface.

This comment seems relevant:

    /** If this symbol is an implementation class, its interface, otherwise the symbol itself
     *  The method follows two strategies to determine the interface.
     *   - during or after erasure, it takes the last parent of the implementation class
     *     (which is always the interface, by convention)
     *   - before erasure, it looks up the interface name in the scope of the owner of the class.
     *     This only works for implementation classes owned by other classes or traits.
     *     !!! Why?
     */
    def toInterface: Symbol = this

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@scabug scabug commented Jan 20, 2013

@gkossakowski said:
Jason, are you looking more into this ticket? Do you want it to be reassigned to you?

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@scabug scabug commented Jan 20, 2013

@retronym said:
Yep, I'll take a look.

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@scabug scabug commented Jan 21, 2013

@retronym said:
A fix is quite involved, for now I've just issued an implementation restriction when we get into this situation, rather than crashing.

scala/scala#1946

@scabug scabug closed this Jan 26, 2013
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@scabug scabug commented Mar 15, 2013

@paulp said:
Amassing yet more evidence that I've basically wasted my life, this is a duplicate of #2897. Here's the reproduction from that ticket, which I'll close because higher numbers are better.

  def f1(t: String) = {
    trait T {
      def xs = Nil map (_ => t)
    }
    ()
  }

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