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This commit converts the lexers and all the parser machinery to use the new parser types and diagnostics infrastructure. Furthermore, it cleans up the way the parser code was emitting hints. As a result of this systematic approach, the test output of the `InfixAppPatErr` and `T984` tests have been changed. Previously they would emit a `SuggestMissingDo` hint, but this was not at all helpful in resolving the error, and it was even confusing by just looking at the original program that triggered the errors. Update haddock submodule
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