Simple Scala "DSL" example using easy to understand constructs.

build.sbt

name := "story"

version := "1.0"

scalaVersion := "2.9.2"

mainClass in (Compile, run) := Some("Story")

Story.scala

object Story {
  object Once { def upon = (x: a.type) => x }
  object a { def time = (x: languages.type) => x }
  object languages { def were = (x: inflexible.type) => x }
  object inflexible { def along = (x: came.type) => x }
  object came { def Scala = (x: inflexible.type) => x }
  implicit def string(s : String) : inflexible.type = inflexible

  def main(args: Array[String]): Unit = {
    Once upon a time languages were inflexible; "Then " along came Scala ". The End!"
  }
}

This example appears to out-of-date with Scala version 2.13.10.

1. build.sbt/7: 'in' is deprecated.
2. build.sbt/7 ':=' is not recognized.

I get other errors, too many to comment on here. I get an enormous stack-trace that begins with:

error: error while loading package, Missing dependency 'class java.lang.Object', required by C:\Users\carys\AppData\Local\Coursier\Cache\v1\https\repo1.maven.org\maven2\org\scala-lang\scala-library\2.9.2\scala-library-2.9.2.jar(scala/package.class)
error: scala.tools.nsc.MissingRequirementError: class java.lang.String not found.

How to resolve this? Other Scala projects I have that don't use DSL work fine.