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How to fix parse error on input `=' I am getting when I try to run a very small Haskell program using ghci?

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" parse error on input `=' " is very common error a new Haskell programmer gets when he/she tries to run the program. This reason for this error is using tab instead of spacebar to put spaces in the code.

Solution is - delete the spaces provided using the tab bar and use spacebar to provide spaces or to align the codes.