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resolveOverloaded returns NoSymbol instead of the expected method symbol #6061

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scabug opened this issue Jul 11, 2012 · 2 comments
Closed

resolveOverloaded returns NoSymbol instead of the expected method symbol #6061

scabug opened this issue Jul 11, 2012 · 2 comments
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@scabug scabug commented Jul 11, 2012

Consider the following class with the overloaded method a:

class C {
  def a(x: Int) = 1
  def a(x: String) = 2
}

Invocation of method a with a argument of type Char returns 1 (numeric widening):

scala> new C().a(32 : Char)
res4: Int = 1

resolveOverload on the term symbol a however returns NoSymbol (signalling an overload ambiguity):

scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._

scala> import scala.reflect.runtime.{ currentMirror => cm }
import scala.reflect.runtime.{currentMirror=>cm}

scala> class C {
     |   def a(x: Int) = 1
     |   def a(x: String) = 2
     | }
defined class C

scala> val t = typeOf[C]
t: reflect.runtime.universe.Type = C

scala> val a = t.member(newTermName("a")).asTermSymbol
a: reflect.runtime.universe.TermSymbol = value a

scala> a.alternatives.size
res5: Int = 2

scala> val aSymb = a.resolveOverloaded(posVargs = List(typeOf[Char]))
aSymb: reflect.runtime.universe.Symbol = <none>

scala> aSymb == NoSymbol
res6: Boolean = true

In order to reproduce this bug use the following input:

import scala.reflect.runtime.universe._
import scala.reflect.runtime.{ currentMirror => cm }
class C {
  def a(x: Int) = 1
  def a(x: String) = 2
}
val t = typeOf[C]
val a = t.member(newTermName("a")).asTermSymbol
val aSymb = a.resolveOverloaded(posVargs = List(typeOf[Char]))
aSymb == NoSymbol
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@scabug scabug commented Jul 11, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6061?orig=1
Reporter: @dgruntz
Affected Versions: 2.10.0

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@scabug scabug commented Jul 11, 2012

@dgruntz said:
proposed fix in scala/scala#883

@scabug scabug closed this Jul 18, 2012
@scabug scabug added this to the 2.10.0-M5 milestone Apr 7, 2017
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