You can easily shadow a name in a let binding in Haskell For example, let x = 5 ... | Hacker News

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_fq4v on Dec 9, 2017 | parent | context | favorite | on: Git is a purely functional data structure (2013)

You can easily shadow a name in a let binding in Haskell

For example,

let x = 5 in let x = 6 in putStrLn (show x)

would print 6. Unless you turn on compiler warnings, there is never a need to choose new names for variables if the old version is no longer needed.

catnaroek on Dec 10, 2017 [–]

Shadowing isn't the same thing as redefining. Try evaluating the following expression:

    let x = 4 ; f y = x + y in let x = 6 in f 10

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