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cannot reflect against instances of local classes #6323

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scabug opened this issue Sep 6, 2012 · 3 comments
Closed

cannot reflect against instances of local classes #6323

scabug opened this issue Sep 6, 2012 · 3 comments
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@xeno-by
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has PR reflection
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2.10.0-M7

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@scabug
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scabug commented Sep 6, 2012 

import scala.reflect.runtime.universe._
import scala.reflect.runtime.{currentMirror => m}
import scala.reflect.runtime.{universe => u}

object Test {
  def main(args: Array[String]) {
    case class Test(a:String,b:List[Int])

    val lookAtMe = m.reflect(Test("a",List(5)))
    val value = u.typeOf[Test]
    val members = value.members
    val member = value.members.filter(_.name.encoded == "a")
    val aAccessor = lookAtMe.reflectMethod(member.head.asMethod)
    val thisShouldBeA = aAccessor.apply()
    println(thisShouldBeA)
  }
}
C:\Projects\Kepler\sandbox @ ticket/6246>myke run Test.scala
Main class (default is Test):
scala.ScalaReflectionException: expected a member of class Test$3, you provided value Test.Test.a
        at scala.reflect.runtime.JavaMirrors$JavaMirror.ErrorNotMember(JavaMirrors.scala:127)
        at scala.reflect.runtime.JavaMirrors$JavaMirror.scala$reflect$runtime$JavaMirrors$JavaMirror$$checkMemberOf(JavaMirrors.scala:163)
        at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaInstanceMirror.reflectMethod(JavaMirrors.scala:191)
        at scala.reflect.runtime.JavaMirrors$JavaMirror$JavaInstanceMirror.reflectMethod(JavaMirrors.scala:173)
        at Test$.main(Test.scala:13)
        at Test.main(Test.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at scala.tools.nsc.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClassLoader.scala:71)
        at scala.tools.nsc.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)
        at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:139)
        at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:71)
        at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:139)
        at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:28)
        at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:45)
        at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:35)
        at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:45)
        at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)
        at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:96)
        at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:105)
        at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
@scabug
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scabug commented Sep 6, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6323?orig=1
Reporter: @xeno-by

@scabug
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scabug commented Sep 6, 2012

@xeno-by said:
A workaround:

import scala.reflect.runtime.universe._
import scala.reflect.runtime.{currentMirror => m}
import scala.reflect.runtime.{universe => u}

object Test {
  def main(args: Array[String]) {
    case class Test(a:String,b:List[Int])

    val lookAtMe = m.reflect(Test("a",List(5)))
//    val value = u.typeOf[Test]
    val value = m.classSymbol(classOf[Test]).typeSignature
    val members = value.members
    val member = value.members.filter(_.name.encoded == "a")
    val aAccessor = lookAtMe.reflectMethod(member.head.asMethod)
    val thisShouldBeA = aAccessor.apply()
    println(thisShouldBeA)
  }
}

@scabug scabug closed this as completed Sep 14, 2012
@scabug
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scabug commented Sep 14, 2012

@xeno-by said:
Fixed in scala/scala@0eabb63 and scala/scala@524c90d

@scabug scabug added this to the 2.10.0-M7 milestone Apr 7, 2017
@scabug scabug mentioned this issue Apr 7, 2017
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