the author mentions in a note that bash was complaining and that they might put the labels in comments to dodge the issue. They might also be able to change the

the author mentions in a note that bash was complaining and that they might put the labels in comments to dodge the issue. They might also be able to change the label format to `: label`. `:` just returns true regardless of what parameters you pass it, so it could still look "labelish" without having to use an actual comment.