Is there an ergonomic way to mix ModalResult and Result parsers?

[DavidAntliff]

I have a set of parse functions that mostly return winnow::Result<T>. In almost all cases I'm happy for the alt-style back-tracking to resolve any issues and eventually fail.

However there are one or two cases where I want the parsing to stop immediately, mostly for sensible error reporting. In this case I believe I should use cut_err() with a parse function that returns winnow::ModalResult<T>, so that winnow::error::ParseError.inner() has the last thing that failed, rather than a parent alt().

As far as I can tell, this requires any parse function that calls this parse function to also return ModalResult, otherwise manual conversion from ModalResult to Result is required. However, I'm really hesitant to go and change the return type on all my parse functions, just to handle these few cases.

Is there a way to more easily mix these parsers, or is the design intention that "migration to ModalResult" implies that all parse functions are changed to return ModalResult?

Or am I better off just biting the bullet and changing them all to ModalResult?

[epage]

If you can't find another way to structure your parser (e.g. with dispatch!) then you need to switch ModalResult to carry your cut_err up the stack.

[DavidAntliff]

I see, that makes sense when you put it that way - thank you.