Possible wrong async stacktrace

[kpodsiad]

The following snippet

//> using scala "2.13.8"
//> using lib "org.typelevel::cats-effect:3.3.11"

package a

import cats.effect.IOApp
import cats.effect.IO

object Main extends IOApp.Simple {
  val io = IO(5)
  val x = List()
  override def run: IO[Unit] = io
    .flatMap(_ => IO(x(5)))
    .void
}

produces following stacktrace

java.lang.IndexOutOfBoundsException: 5
        at scala.collection.LinearSeqOps.apply(LinearSeq.scala:117)
        at scala.collection.LinearSeqOps.apply$(LinearSeq.scala:114)
        at scala.collection.immutable.List.apply(List.scala:79)
        at a.Main$.$anonfun$run$2(Stacktraces.scala:13)
        at apply @ a.Main$.$anonfun$run$1(Stacktraces.scala:13)
        at apply @ a.Main$.<clinit>(Stacktraces.scala:10)
        at flatMap @ a.Main$.run(Stacktraces.scala:13)
        at void @ a.Main$.run(Stacktraces.scala:13)
        at run$ @ a.Main$.run(Stacktraces.scala:9)

at void @ a.Main$.run(Stacktraces.scala:13) looks wrong to me, shouldn't it be line 14 instead?

[armanbilge]

Thanks. Yep, it definitely seems wrong (we can probably make this an issue). The stack trace enhancing code is kind of fiddly, not sure how easy this is to fix 🙃

[kpodsiad]

Thanks for response @armanbilge, I'll create an issue from this.