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Hi Patrick,

> Speaking with the experience of making this [1], I imagine supporting
> syntax errors would involve something like:
> ...
> [1]

Thank you for the pointer and the suggestion. This is a very clever
approach to formatting that I haven't seen before.

> You could add captures to mark nodes as unknown. Finally, supporting
> incomplete nodes like while would involve a similar alternative for
> the end keyword.

I've been thinking about making "end" optional and then use its
capture to remove "incomplete" mark from the node. Not sure if there
is a better way to handle this.