My vote is to not drop support for 2.10 until support for multiple Scala versions is no longer experimental but considered "stable" or even "mostly working".
Smaller projects might be able to switch to 2.11 very quickly, but larger organizations might find it tricky to migrate their entire codebase to 2.11 at once. I briefly attempted to get our build working on using the Xsource flag, but ran into a few problems / annoyances:
1) I have to change the source level for every project (we have quite a few), as auto-detection doesn't seem to be working.
2) Even then, there were compile errors.
At that point I just gave up as the 2.10 editor worked fine for me.
I'm happy to try again sometime, but I would be rather sad to see 2.10 support removed until we know multi-version support is working well.
On Tuesday, June 17, 2014 12:47:24 PM UTC-7, ijuma wrote: