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reflective typechecker fails for singleton object containing trait #5415

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scabug opened this issue Jan 27, 2012 · 4 comments
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reflective typechecker fails for singleton object containing trait #5415

scabug opened this issue Jan 27, 2012 · 4 comments
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@scabug scabug commented Jan 27, 2012

Reproduce Code:

import scala.reflect.mirror._
import scala.reflect.Code
import scala.tools.nsc.reporters._
import scala.tools.nsc.Settings
import scala.reflect.runtime.Mirror.ToolBox

package scala.collection.slick{
  case class Queryable2[T](){
    def filter( predicate: T => Boolean ) = ???
  }
  object Test2 extends App{
    def typecheck( tree:Tree ) = {
      val reporter = new ConsoleReporter(new Settings)
      val toolbox = new ToolBox(reporter)
      val typed_tree = toolbox.typeCheck(tree)
    }
    val q = Queryable2[CoffeesTable]()
    trait CoffeesTable{
      def sales : Int
    }
    typecheck(Code.lift[Tree]{ q.filter(_.sales > 5) }.tree )
    q.filter(_.sales > 5)
  }
}

Code compiles fine, but fails at runtime during reflective type checking.

Expected result:

Exception in thread "main" scala.NotImplementedError: an implementation is missing
	[...]
	at scala.collection.slick.Test2$delayedInit$body.apply(Bug.scala:22)
	[...]

Actual result:

Exception in thread "main" scala.reflect.internal.Types$TypeError: type mismatch;
 found   : scala.collection.slick.Test2.CoffeesTable => Boolean
 required: scala.collection.slick.Test2#CoffeesTable => Boolean	at 	[...]
	at scala.collection.slick.Test2$delayedInit$body.apply(Bug.scala:21)
	[...]
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@scabug scabug commented Jan 27, 2012

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@scabug scabug commented Jan 27, 2012

@xeno-by said:
The bug manifests itself even if the entire thing is in an empty package. Also, enabling -uniqid in settings has provided sort of more accurate error message

scala.reflect.internal.Types$TypeError: type mismatch;
 found   : Test2.CoffeesTable#1915 => Boolean#196
 required: Test2#1910.CoffeesTable#1915 => Boolean#196
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@scabug scabug commented Jan 27, 2012

@xeno-by said:
After being upgraded to also print symbol kinds, error message reveals the root of the problem:

 found   : Test2#1909#MC.CoffeesTable#1915#TR => Boolean#196#CLS
 required: Test2#1910#FV.CoffeesTable#1915#TR => Boolean#196#CLS
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@scabug scabug commented Feb 3, 2012

@xeno-by said:
Fixed by scala/scala@363f8af

@scabug scabug closed this Feb 3, 2012
@scabug scabug added this to the 2.10.0-M1 milestone Apr 7, 2017
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