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Editorial Team
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Asked: 2026-06-11T02:38:45+00:00

data Exp = Let String Exp Exp | Exp1 Exp1 deriving Show What does

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data Exp  
  = Let String Exp Exp
  | Exp1 Exp1
  deriving Show

What does the Let keyword from the documentation page example mean? (I am aware of the normal meaning of let)

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1 Answer

  1. Editorial Team

    It’s not a keyword. It’s simply a name given to the first constructor of the Exp type. The first Exp1 on the second line is the name of the second constructor.

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