Scala console/REPL becomes unresponsive when using parallel collections

[Delors]

Start the scala console (2.12) and paste the following snippet:

List(1,2).par.foreach(println)

After pressing return nothing will happen; when ".par" is removed, the code works as expected.

(The example works as soon as the code snippet is put in a def: object o { def run = List(1,2).par.foreach(println) } and calling o.run runs fine. )

[martijnhoekstra]

Duplicate of #9076?