Error "(no value) used as value" from Go compiler using oklog/run

I am working on a simple example of oklog/run package, and am seeing this compilation error in VS Code when trying to return a log of the error:

log.Errorf("abnormal termination: %s", err) (no value) used as value

In the description of group.Run it says

"..Run only returns when all actors have exited. Run returns the error returned by the first exiting actor."

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I’m wondering if that has something to do with it, like it can’t compile with the currently non-existent error because the run.Group hasn’t all returned yet?

Thanks for any help you may have.

Code:

package main

import (
    "context"
    "time"

    "github.com/oklog/run"
    "github.com/pkg/errors"
    log "github.com/sirupsen/logrus"
)

func logAForever(ctx context.Context) {
    for {
        select {
        case err := <-ctx.Done():
            log.Error(err)
            return
        default:
            log.Info("A")
            time.Sleep(1 * time.Second)
        }
    }
}

func logBFor10Sec(ctx context.Context) {
    for i := 1; i < 10; i++ {
        log.Info("B")
        time.Sleep(1 * time.Second)
    }
}

func main() {
    ctx, testStopFunc := context.WithCancel(context.Background())

    var group run.Group

    group.Add(func() error {
        log.Info("First actor added to run group. Starting execute function...")
        logAForever(ctx)
        return nil
    }, func(error) {
        log.Info("The first interrupt function was invoked.")
        testStopFunc()
        time.Sleep(100 * time.Millisecond)
    })

    group.Add(func() error {
        log.Info("Second actor added to run group. Starting execute function...")
        logBFor10Sec(ctx)
        return nil
    }, func(error) {
        log.Info("The second interrupt function was invoked.")
        testStopFunc()
        time.Sleep(100 * time.Millisecond)
    })

    if err := group.Run(); !errors.As(err, &run.SignalError{}) {
        // return
        return log.Errorf("abnormal termination: %s", err)
    }

}

Error from VSCode compiler:

>Solution :

log.Errorf returns no value, but you are trying to return it via the return keyword.

Try this code instead:

if err := group.Run(); !errors.As(err, &run.SignalError{}) {
  log.Errorf("abnormal termination: %s", err)
  return
}