Incorrect Read deriving for MagicHash constructors

Greetings,

A fellow in #haskell on freenode just discovered the following bug:

{-# LANGUAGE MagicHash #-}

data Note = A# deriving (Show, Read)

show works fine, but read doesn't:

*Main> show A#
"A#"
*Main> read (show A#)
*** Exception: Prelude.read: no parse

Probably not a surprising omission, and hopefully not difficult to fix.

Trac metadata

Trac field	Value
Version	7.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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