Failure to find type class implementation with Scala 2.10.4, Macro Paradise 2.0.0-M6

test.scala

package mymacro.test

import scala.annotation.StaticAnnotation
import scala.language.experimental.macros
import scala.reflect.macros.Context

trait MyTypeClass[T] {
  def something: Int
}

class MyMacro extends StaticAnnotation {
  def macroTransform(annottees: Any*) = macro MyMacro.impl
}

object MyMacro {
  private[this] def buildDeclarations(c: Context)(classDeclaration: c.universe.ClassDef,
                                                  companionDeclaration: Option[c.universe.ModuleDef]): c.Tree = {
    import c.universe._
    val q"$modifiers class $typeName[..$tparams] $constructorModifiers(..$first_params)(...$rest_params) extends $early with ..$parents { ..$body }" = classDeclaration
    q"""
class $typeName {
  def stuff = println("hi")
}

object ${typeName.toTermName} {
  implicit object isTypeClass extends _root_.mymacro.test.MyTypeClass[$typeName] {
    override def something = 5
  }
}
"""
  }

  def impl(c: Context)(annottees: c.Expr[Any]*): c.Expr[Any] = {
    import c.universe._
    val inputs = annottees.map(_.tree).toList
    val declarations = inputs match {
      case Nil =>
        c.abort(c.enclosingPosition, "No struct target")
      case (classDeclaration: ClassDef) :: Nil =>
        buildDeclarations(c)(classDeclaration, None)
      case (classDeclaration: ClassDef) :: (companionDeclaration: ModuleDef) :: Nil =>
        buildDeclarations(c)(classDeclaration, Some(companionDeclaration))
      case _ =>
        c.abort(c.enclosingPosition, "Invalid struct target")
      }
    println(declarations)
    c.Expr(declarations)
  }
}

@MyMacro class Thingamajig

class ManualThingamajig {
  val asdf = 1.0f
}

object ManualThingamajig {
  implicit object isTypeClass extends MyTypeClass[ManualThingamajig] {
    override def something = -2
  }
}

object TestApp extends App {
  implicitly[MyTypeClass[ManualThingamajig]]
  implicitly[MyTypeClass[Thingamajig]] // unable to resolve
}

scalamacros/paradise#13