Fatal exceptions hang the runner

[kubukoz]

Using 0.8.3, when you run this suite (or anything else that produces an exception of the "fatal" sort), it hangs the runner.

import weaver._

import cats.effect.IO

object DemoTestWeaver extends SimpleIOSuite {

  pureTest("demo") {
    throw new NoClassDefFoundError("fake exception")
  }
}

This is inconsistent with munit and scalatest's behavior, and hopefully it's something that can be fixed on weaver's side.

Related: #503

Repro project: https://github.com/kubukoz/demos/tree/sbt-weaver-hang

[eugkhp]

hey! Do you need any help with this? Is it planned to be resolved, or is this intended behavior?