Parser.y rewrite with parser combinators

[Alan & Kim Zimmerman]

I am not against this proposal,  but want to raise a possible future
concern.

As part of improving the haskell tooling environment I am keen on making
GHC incremental, and have started a proof of concept based in the same
techniques as used in the tree-sitter library.

This is achieved by modifying happy, and requires minimal changes to the
existing Parser.y.

It would be unfortunate if this possibility was prevented by this rewrite.

Alan
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