scala-cli stalls when awaiting every single result from a list of Futures.

[cheapsolutionarchitect]

Version(s)
scala-cli 1.0.2, 1.0.4, Java 11

Describe the bug

Running the code linked in "To Reproduce" stalls the execution until the timeouts are reached.

To Reproduce

Copy the code provided here https://scastie.scala-lang.org/c8icnGOiSAO6jOoewoFXHw into a file called paralleltest.sc and run it with scala-cli -S 2.13.10 paralleltest.sc

Expected behaviour

Running the code from the Scala 2.13.10 REPL or with sbt finishes the execution without stalling the process. This should be the same for scala-cli.

[SethTisue]

@MaciejG604 offhand, this seems like the sort of thing that #2033 should have prevented?

note that the same script succeeds in Scala 3

[MaciejG604]

Due to the usage of a strictly Scala 3 feature in the class wrapper (export), Scala 2 scripts can't use it and will still suffer from deadlocks when parallelism is used.

However, we may have a solution for that that seems to have been overlooked before.