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import scala.language.experimental.macros
import scala.reflect.macros.blackbox.Context
object Macros {
def impl[T](c: Context)(implicit ttag: c.WeakTypeTag[T]): c.Expr[List[String]] = {
import c.universe._;
val ttpe = ttag.tpe
val tsym = ttpe.typeSymbol.asClass
val subclasses = tsym.knownDirectSubclasses.toList.map(_.name.toString)
c.Expr[List[String]](q"$subclasses")
}
def knownDirectSubclasses[T]: List[String] = macro impl[T]
}
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