Hi titto,
You should try to give a complete list of steps which can be run to
reproduce your problem. This also includes ghci --version output and
maybe some info about the OS you're working on.
So how you you load the code into ghci? Using ghci File.hs or :l ?
In any case you want to declare the show method:
-- yes, I know I should just use 'deriving (Show)' because most
-- developers expect Read Show instances to work the common way
-- which means they serialize and unserialize data types in a reliable
-- way ...
instance Show Test where
show (Test s) = "my show implementation of Test: Test " ++ s
Marc Weber
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