There is no more -Xsource:2.14, only -Xsource:3

[dwijnand]

Back when it was introduced, Scala 2.14 was in the plan. But now the plan is to not have a 2.14 as a transition to 3.0 but to transition straight from 2.13. So this repoints 2.14 to 3.

[lrytz]

Should we also add a warning when someone says -Xsource:2.14? Because after this PR, that setting no longer has an effect.

[dwijnand]

Should we also add a warning when someone says -Xsource:2.14? Because after this PR, that setting no longer has an effect.

Eugene's making that argument in #8812 (comment)

[som-snytt]

I have a commit to remove 2.12; and we can also eliminate 2.13, which has more usages, because isScala213 is now always true. (There are more usages of 213.)

I think an arbitrary future version is acceptable, e.g., -Xsource:3.2 to pick up anything they might be trying out. There are so many dotty features they routinely push out, "maybe after 3.0, 3.2".

Similarly for anyone using 2.14.

[dwijnand]

I don't mind rebasing my PR if yours lands first. Also, if you'd like, I could rebase yours if this lands first. But I think it's best to keep them separate so neither impedes the other from landing. (Though I'm happy to be convinced to combine them.)