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Arnold deVos arnolddevos

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Revisiting Tagless Final Interpreters

Tageless Final interpreters are an alternative to the traditional Algebraic Data Type (and generalized ADT) based implementation of the interpreter pattern. This document presents the Tageless Final approach with Scala, and shows how Dotty with it's recently added implicits functions makes the approach even more appealing. All examples are direct translations of their Haskell version presented in the Typed Tagless Final Interpreters: Lecture Notes (section 2).

The interpreter pattern has recently received a lot of attention in the Scala community. A lot of efforts have been invested in trying to address the biggest shortcomings of ADT/GADT based solutions: extensibility. One can first look at cats' Inject typeclass for an implementation of [Data Type à la Carte](

ltackmann / Build.scala
Created Nov 7, 2011
Task that aggregate resources from dependencies in SBT 0.11
View Build.scala
import sbt._
import Keys._
object ProjectBuild extends Build {
// setup sub projects
// ...
lazy val warproj = Project("war-project", file("."), settings = buildSettings) dependsOn(subproj1, subproj2 /* ... */)
val buildSettings = {