I am trying to run the following from the GHCi command prompt which results in parse error.

--------------

Prelude> :{

Prelude| foo :: Maybe String

Prelude| foo = do

Prelude|     x <- Just 3

Prelude|     y <- Just "!"

Prelude|     Just (show x ++ y)

Prelude| :}

<interactive>:145:5: parse error on input `='

---------------

Any help would be appreciated.

Thanks,

Shishir 

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