Lisp people are quick to rewrite basic language semantics. As somebody already said, rewriting parsers is more of a Haskell thing to do. That said, Lisp develo

Lisp people are quick to rewrite basic language semantics. As somebody already said, rewriting parsers is more of a Haskell thing to do. That said, Lisp developers learn to fight their instinct and not redefine the language all the time, just as Haskell developers learn to fight their instinct and not make complex types all the time, and C++ developers learn to fight their instinct and not use STL all the time. But those take some experience.