IO.raiseError(...) doesn't immediately surface fatal errors

[armanbilge]

Consider:

//> using dep "org.typelevel::cats-effect::3.5.1"

import cats.effect.*

object App extends IOApp.Simple:
  def run = IO.raiseError(new VirtualMachineError {}).voidError

Even though a VirtualMachineError is a fatal error, that program completes normally.

If we change it to:

  def run = IO(throw new VirtualMachineError {}).voidError

then the fatal error is surfaced immediately as expected.

h/t @kamilkloch

[scott-thomson239]

Hi, I'd like to help with this if it's not already being worked on

[armanbilge]

@scott-thomson239 thanks! You can target your PR to series/3.5.x branch.

[armanbilge]

@scott-thomson239 are you still working on this one? let us know if you have any questions!

[scott-thomson239]

Sorry for my silence on this. I've raised a PR with what I think is the fix now.