How to compile and execute scala code at run-time in Scala3?

Question

I would like to compile and execute Scala code given as a String at run-time using Scala3. Like for example in Scala 2 I would have used Reflection

import scala.reflect.runtime.universe as ru
import scala.tools.reflect.ToolBox
val scalaCode = q"""println("Hello world!")"""
val evalMirror = ru.runtimeMirror(this.getClass.getClassLoader)
val toolBox = evalMirror.mkToolBox()
toolBox.eval(scalaCode) //Hello world!

If I try to run this code in Scala3 I get

Scala 2 macro cannot be used in Dotty. See https://dotty.epfl.ch/docs/reference/dropped-features/macros.html
To turn this error into a warning, pass -Xignore-scala2-macros to the compiler

How can I translate this code in Scala3?

Answer 1

According to this comment from Professor Odersky it seems the feature your searching for has been intentionally removed.

Answer 2

For example you can use Ammonite

ammonite.Main(verboseOutput = false).runCode("""println("Hello world!")""")
// Hello world!

build.sbt

lazy val root = project
  .in(file("."))
  .settings(
    name := "scala3demo",
    version := "0.1.0-SNAPSHOT",
    scalaVersion := "3.1.3",
    libraryDependencies ++= Seq(
      "com.lihaoyi" % "ammonite" % "2.5.4-22-4a9e6989" cross CrossVersion.full,
    ),
    excludeDependencies ++= Seq(
      ExclusionRule("com.lihaoyi", "sourcecode_2.13"),
      ExclusionRule("com.lihaoyi", "fansi_2.13"),
    ),
  )