RE: deriving weirdness on newtypes

[Simon Peyton-Jones]

|     newtype Foo = Foo Int deriving (Num)
|     instance Show Foo where { show = undefined }
| 
| then, the value of 'show (Foo 5)' is undefined, but the value of 'show
| (5::Foo)' is "5".  definately *WRONG*.

You're right.   This is all a bit more complicated than I (or John H)
thought.  Thinking cap on.  But don't hold your breath.

Simon

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