the impossible happened?

[guest]

I've added this line to a .hs file: data Shape = Circle Float Float Float | Rectangle Float Float Float Float deriving (show) Afterwards whenever I try to load it with the :load ex2.hs command, ghci removes all modules (so the prompt becomes > instead of whatever I've loaded) and returns an error message displaying that I should report this unthinkable occurance here. My apologies for doing this anonymously and rather brief but I'm on an academic deathline so time is of the essence :)

[monoidal]

Thank you for the report; it is a duplicate of the bug #5961 and already fixed in GHC 7.6. You need to write the class name starting with a capital: "deriving (Show)".