> But it’s only more of the time: your source will still be invalid frequently, including when it gets things wrong and you have to relocate a delimiter. In pra

> But it’s only more of the time: your source will still be invalid frequently, including when it gets things wrong and you have to relocate a delimiter. In practice, I don’t think it’s useful on that ground. Maybe it's like a pale imitation of structural editing? There are editing modes for some editors that more or less ensure the syntax is always valid as you edit, and they of course include this feature.