[Haskell-beginners] "Learn You a Haskell" question

[Frank]

Hi,
    I'm reading "Learn You a Haskell..." and have a question about the
chapter "Making Our Own Types and Typeclasses". On the 'Functor'/'Either'
example, I feel completely lost. I don't see why the 'Left x' portion of
'Functor (Either a)' is simply 'Left x' and the document is not exactly
clear. Any clarification would be most appreciated.

Sincerely,
Frank D. Martinez


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