if err != nil {
			if firstErr == nil && !os.IsNotExist(err) {
				firstErr = err
			}
			continue
		}
		for _, fi := range fis {
			data, err := os.ReadFile(directory + "/" + fi.Name())
			if err == nil {
				roots.AppendCertsFromPEM(data)
			}
		}
	}

	if roots.len() > 0 || firstErr == nil {
		return roots, nil
	}

	return nil, firstErr
}

	f.sb.Reset()
	return err
}

func (t *tracer) Close() error {
	f := <-t.file
	defer func() { t.file <- f }()

	_, firstErr := f.f.WriteString("]")
	if err := f.f.Close(); firstErr == nil {
		firstErr = err
	}
	return firstErr
}

func (t *tracer) getNextTID() uint64 {
	return t.nextTID.Add(1)
}

func (t *tracer) getNextFlowID() uint64 {
	return t.nextFlowID.Add(1)

		msg = "\t" + msg
	}

	e := Error{
		Pos:  pos,
		Msg:  stripAnnotations(msg),
		Full: msg,
		Soft: soft,
		Code: code,
	}

	if check.firstErr == nil {
		check.firstErr = e
	}

	f := check.conf.Error
	if f == nil {
		panic(bailout{}) // record first error and exit
	}
	f(e)
}

const (
	invalidArg = "invalid argument: "

		// to the position (pos) in the original expression.
		span := spanOf(check.errpos)
		e.Pos = span.pos
		e.go116start = span.start
		e.go116end = span.end
	}

	if check.firstErr == nil {
		check.firstErr = e
	}

	f := check.conf.Error
	if f == nil {
		panic(bailout{}) // record first error and exit
	}
	f(e)
}

const (
	invalidArg = "invalid argument: "