[Haskell-cafe] Why GHC is written in Happy and not a monadic parser library?

[blackbox.dev.ml]

Hi!
Is there any specific reason why GHC is written in a parser GENERATOR
(Happy) and not in MONADIC PARSER COMBINATOR (like parsec)?

Is Happy faster / handles better errors / hase some great features or
anything else?

thank you :)
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