Release 2.11.13

[retronym]

NOTE: at this point, we are not committing to another 2.11 release -- this is a placeholder to collect TODOs in case we do decide to cut another release.

Motivation:

• Backport ASM upgrade to fix regression: Update ASM to 6.0 scala#6180
• Fix regression in runner script with unset $JAVA_HOME
• Opportunity for community to help with more targetted backports, in particular ones that help Spark along the lines of Fix for SI-9881 in branch 2.11.x scala#6195
• Backport Fix "cannot be represented as URI" in JDK 13 scala#8210

[sjrd]

Advertising a regression I had found in 2.10.7 and 2.11.12: scala/bug#10609

Note that personally, I don't care whether it's going to be fixed or not; I just disabled the failing test in our test suite. But maybe this affects other people.

[mpetruska]

Might make sense to talk about scala/scala#6195.
It causes a Spark-shell issue SPARK-22393.
Please note that the changes in that PR are "retrofitted" into Spark-shell (not merged yet), so this is not really a priority.

[SethTisue]

note that publishing 2.11.13 would now require either resurrecting some now-decayed/disabled Jenkins stuff, or backporting the Travis-CI-based publishing from 2.12.x

[smarter]

Crashes due to -Yrangepos validation affect IDE and tooling (e.g. scalameta) users, so it'd make a ton of sense to backport scala/scala#6754

[smarter]

Apparently 2.12 can emit code that causes ambiguous method errors in javac starting with Java 11, this should be fixed by scala/scala#7035. I assume that 2.11 is affected by this and could benefit from a backport.

[SethTisue]

if this happens, we might want to backport the license change to Apache 2 (scala/scala#7314, scala/scala#7407, scala/scala#7730, scala/scala#8015)

[SethTisue]

and undeprecate .linesIterator, as we did in 2.12.8

[SethTisue]

and bump the copyright year to 2019 or whatever. (I'm about to PR this to 2.12.x.)

[SethTisue]

this is only a would-be-nice, but if the 2.11.x REPL could be made to work on JDK 11, without risk of breaking something else, that'd be nice. it's scala/bug#10603

[SethTisue]

this hashmap fix backport PR could be reopened and merged: scala/scala#7522