scala 3 vs scala 2

[xhudik]

Hi, a newbie question:
if I add println(Console.YELLOW + s"Scala version = ${util.Properties.versionString}") into Main.scala and run sbt run I got:

Scala version = 2.13.4
Trait Params example:
Hello Dotty!

...

Any idea why I'm getting 2.13.4 instead of Scala 3.0.0RC1? (the true is that I have installed Scala 2.13.4 on my local laptop)

[bishabosha]

Yes, this is because Scala 3.0.0-RC1 reuses the standard library from 2.13.4, where scala.util.Properties is defined. The version string is stored in a file shipped in the org.scala-lang:scala-library:2.13.4 JAR.

[xhudik]

Thanks @bishabosha ;
will final Scala 3 uses its own standard library? Other question - is there any way to find out what scala version is running the app?

[bishabosha]

is there any way to find out what scala version is running the app?

if your application includes the scala3-compiler_3.0.0-RC1 library in the classpath then you can use dotty.tools.dotc.config.Properties.versionString to get the Scala 3 version, or dotty.tools.dotc.config.Properties.versionMsg to include copyright message and optional git hash if it is a nightly. This is the property that is accessed when using -version flag with the compiler

[xhudik]

indeed, this is working - thank you @bishabosha !! I'm closing the issue