Remove magic parsing of (~)

It seems that (~) has magical parsing:

Prelude> :i (~)

<interactive>:1:2: parse error on input ‘~’
Prelude> :k (~)
(~) :: k -> k -> Constraint
Prelude> :i (+)   -- for comparison
class Num a where
  (+) :: a -> a -> a
  ...
  	-- Defined in ‘GHC.Num’
infixl 6 +

Now that type operators do not need to start with a colon, this magic seems unnecessary. The (~) syntax does not need to be wired-in, unless I'm missing something. (The definition of (~) needs to be wired in -- it's just the syntax that doesn't need to be.)

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture