Scala example source code file (MissingRequirementError.scala)

This example Scala source code file (MissingRequirementError.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

fatalerror, missingrequirementerror, none, nothing, option, string, throwable

The MissingRequirementError.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala
package reflect
package internal

class MissingRequirementError private (msg: String) extends FatalError(msg) {
  import MissingRequirementError.suffix
  def req: String = if (msg endsWith suffix) msg dropRight suffix.length else msg
}

object MissingRequirementError {
  private val suffix = " not found."
  def signal(msg: String): Nothing = throw new MissingRequirementError(msg)
  def notFound(req: String): Nothing = signal(req + suffix)
  def unapply(x: Throwable): Option[String] = x match {
    case x: MissingRequirementError => Some(x.req)
    case _ => None
  }
}