[Haskell-beginners] where scope

[I. J. Kennedy]

GHC complains that  u  is out of scope in the following definition:

f n =
  let u = [1..n] in g n
  where
    g x = u

Why?  I understand that it's "just the way Haskell works", but I'm
wondering about the rationale of the language designers when deciding
on this scoping behavior.
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