Show correct version when using util.Properties.versionNumberString

[tgodzik]

Compiler version

3.5.2

Minimized code

println(util.Properties.versionNumberString)

Output

2.13.15

or 14 don't remember, but that's not important

Expectation

It should show 3.5.2. For that to happen two steps were suggested:

• Scala 2 library should first check for scala 3 properties
• Scala 3 should have those properties

They should be something like:

/library3.properties
maven.version.number=3.5.2
version.number=3.5.2

maven version might not be needed.

First step should be adding it here, but if we hurry we can add it to Scala 2.13.16

[hamzaremmal]

Why add it to 2.13.16, can't we fully solve it in Scala 3 ?

[tgodzik]

First step should be adding it here, but if we hurry we can add it to Scala 2.13.16

Why add it to 2.13.16, can't we fully solve it in Scala 3 ?

Can we patch the scala library to fix that?

[sjrd]

No, we cannot override class files that exist in the scala-library.jar.

[dwijnand]

The version of the scala-library is 2.13.15. Perhaps you want:

scala> println(dotty.tools.dotc.config.Properties.versionNumberString)
3.6.4-RC1-bin-20241204-a67dbb0-NIGHTLY

[tgodzik]

The version of the scala-library is 2.13.15. Perhaps you want:

scala> println(dotty.tools.dotc.config.Properties.versionNumberString)
3.6.4-RC1-bin-20241204-a67dbb0-NIGHTLY

I think that requires you to have the compiler on your classpath, no?

[dwijnand]

Yeah, it's in scala3-compiler.

[tgodzik]

So normal users will try to use println(util.Properties.versionNumberString) which will point them to thinking they are using Scala 2.13. This has actually happened, people were reporting that a wrong version is being used because that println returned 2.13. So this is quite confusing.

[hamzaremmal]

This should be fixed when we work on #22043 anyways

[dwijnand]

So normal users will try to use println(util.Properties.versionNumberString) which will point them to thinking they are using Scala 2.13. This has actually happened, people were reporting that a wrong version is being used because that println returned 2.13. So this is quite confusing.

I take it back. I think it's reasonable to configure scala-library's scala.util.Properties to try to look for a properties file which we'll ship in scala3-library, as an override.