Enable assisted injection

[xerial]

Combine dependency injection and user-supplied arguments to build objects:

trait HttpServer {
   val name:String = _
   val server = bind[Server]
                       .onStart(_.start)
                       .onShutdown(_.close)
}

val server1 = session.build[HttpServer](name = "server1")
val server2 = session.build[HttpServer](name = "server2)

Related:
https://github.com/google/guice/wiki/AssistedInject

[xerial]

Maybe we can use SAM type support in Scala 2.12: http://www.scala-lang.org/news/2.12.0/#lambda-syntax-for-sam-types
to embed abstract method

[xerial]

This can be done by using Scala function and implementing SessionHolder