Track consumed token count in ParserState (and ParseError)
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pvp:major
- Dominant language
- Haskell
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Description
Relying on (user settable) `SourcePos` for deciding which parse is longer (in `mergeError`) is unreliable.
FWIW `megaparsec` tracks the count.
The #96 is different, as it adds character count to `SourcePos`. Yet, both changes are breaking ones, as `ErrorPos` "constructors" are part of public interface.
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