next code (attached in archive to ticked and available from https://github.com/rssh/scala-gopher/blob/scala-2.11.4-internal-error-localized/src/main/scala/gopherCompilerIssue/Test.scala )

package gopherCompilerIssue

trait TBase
{

class InPortA
{
var v: A = a
}

object InPort
{
def applyA:InPort[A] = new InPort(a)
}

import scala.reflect._
import scala.reflect.runtime.{universe=>ru}

def retrieveVals1T:ru.TypeTag: List[T] =
{
val mirror = ru.runtimeMirror(this.getClass.getClassLoader)
val im = mirror.reflect(o);
val termMembers = im.symbol.typeSignature.members.filter(.isTerm).map(.asTerm)
val retval = (termMembers.
filter ( x => x.typeSignature <:< ru.typeOf[T] && x.isVal).
map ((x:ru.TermSymbol) => im.reflectField(x).get.asInstanceOf[T])
).toList
retval
}

def retrievePorts = retrieveVals1InPort[_]

def recoverFactory: ()=>TBase

}

trait Bingo extends TBase
{
val inX = InPortInt
}
class Suite
{

test("A") {
val bingo = { def factory(): Bingo = new Bingo {
def recoverFactory = factory
}
factory()
}

 bingo.retrievePorts

}

def test(name:String)(fun: => Unit):Unit =
fun

}
object Main
{

def main(args:Array[String]):Unit = {
val s = new Suite();
}

}

produce internal error when run .[info] Running gopherCompilerIssue.Main
[error] (run-main) java.lang.InternalError: Enclosing method not found
java.lang.InternalError: Enclosing method not found
at java.lang.Class.getEnclosingMethod(Class.java:1052)
at scala.reflect.runtime.ReflectionUtils$EnclosedInMethod$$anonfun$$lessinit$greater$1.apply(ReflectionUtils.scala:98)
at scala.reflect.runtime.ReflectionUtils$EnclosedInMethod$$anonfun$$lessinit$greater$1.apply(ReflectionUtils.scala:98)
at scala.reflect.runtime.ReflectionUtils$EnclosedIn.unapply(ReflectionUtils.scala:95)
at scala.reflect.runtime.JavaMirrors$JavaMirror.sOwner(JavaMirrors.scala:842)
at scala.reflect.runtime.JavaMirrors$JavaMirror.scala$reflect$runtime$JavaMirrors$JavaMirror$$classToScala1(JavaMirrors.scala:982)
at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$classToScala$1.apply(JavaMirrors.scala:975)
at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$classToScala$1.apply(JavaMirrors.scala:975)
at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$toScala$1.apply(JavaMirrors.scala:97)
at scala.reflect.runtime.TwoWayCaches$TwoWayCache$$anonfun$toScala$1.apply(TwoWayCaches.scala:39)
at scala.reflect.runtime.Gil$class.gilSynchronized(Gil.scala:19)
at scala.reflect.runtime.JavaUniverse.gilSynchronized(JavaUniverse.scala:16)