Racing Resource causes exception to be printed in standard error

Reproduction script (scala-cli):

//> using lib "org.typelevel::cats-effect:3.3.13"

import cats.effect.*

object Main extends IOApp.Simple:

  def run =
    Resource
      .eval(IO.raiseError(new Exception("Boom")))
      .race(Resource.never)
      .attempt
      .use(_ => 
        IO.println("Done")
      )

Running scala-cli run main.scala gives the following output:

java.lang.Exception: Boom
	at Main$.run(main.scala:9)
	at run$ @ Main$.run(main.scala:5)
Done

where exception stacktrace comes from standard error.

Thanks for reporting. I think this may be related to #2962 and #3085.

This still seems to be a problem as of 3.4.2. Maybe we can fix it as part of #3226.

Workaround for typelevel/cats-effect#3086

@armanbilge

@armanbilge Did we work around this with the specialized race implementation?

Yup! Tried the reproducer with 3.4.2 and 3.4.3 when the new race implementation landed. The fix happened between there anyway :)

Remove workaround

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Racing Resource causes exception to be printed in standard error #3086

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Racing Resource causes exception to be printed in standard error #3086

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armanbilge commented on Jul 10, 2022

armanbilge commented on Dec 21, 2022

djspiewak commented on Feb 27, 2023

armanbilge commented on Feb 27, 2023

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