gistfile1.sbt

package rrs

trait   Configurable
{
    val dir = "/foo/bar"
    val env = "config1.cfg"

    implicit val cde = (dir, env)
}

class   Config(val name: String)
{
    def apply(sect: String)(param: String): String =
      "%s|%s=<don't ask me>".format(sect, param)
}

object  Config
{
    def config(file: String)(implicit de: (String, String)): Config =
      new Config("%s<%s, %s>".format(file, de._1, de._2))
}

class   ConfigMe
extends Configurable
{
  import Config._

  val cfg = config("cf1.cfg")

  val v1 = cfg("foo")("bar")

  val v2 = config("cf1.cfg")("foo")("bar")

  val v3 = (config("cf1.cfg"))("foo")("bar")

  val v4 = config("cf1.cfg").apply("foo")("bar")
}


/*

Config.scala:32: error: type mismatch;
 found   : java.lang.String("foo")
 required: (String, String)
  val v2 = config("cf1.cfg")("foo")("bar")
                             ^
Config.scala:34: error: type mismatch;
 found   : java.lang.String("foo")
 required: (String, String)
  val v3 = (config("cf1.cfg"))("foo")("bar")
                               ^
two errors found

*/