[Haskell-beginners] How to write Read instance

[Baa]

Hello all!

I found some errors in the reading of previously shown big and
complex record. Reason is: some of fields are reading wrongly. So, is
there any useful documents how to write `Read` instance correctly
(because I can't find good tutorial in the Web and often hit errors
with `Read` instance)? May be tutorial/examples/any good info...


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Best regards, Paul