[GHC] #9217: GHCi accepts any operator as a value constructor when enclosed in parens

[GHC]

#9217: GHCi accepts any operator as a value constructor when enclosed in parens
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        Reporter:  wz1000            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  GHCi              |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Other             |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Description changed by wz1000:

Old description:

> Eg:- 'data P = (+) Char Char' is accepted by GHCi
> However 'data P = (-) Char Char' is accepted by GHCi 7.8.2, but is
> reported to be rejected by GHC 7.6.3
> GHCi 7.4 is reported to reject these inputs.
> GHC 7.8.2 also rejects these inputs.
> Operators defined this way are inaccessible and do not shadow existing
> operators.
> Legal operators(those prefixed by a colon) act normally

New description:

 Eg:- 'data P = (+) Char Char' is accepted by GHCi
 However 'data P = (-) Char Char' is accepted by GHCi 7.8.2, but is
 reported to be rejected by GHC 7.6.3
 GHCi 7.4 is reported to reject these inputs.
 GHC 7.8.2 also rejects these inputs.
 Operators defined this way are inaccessible and do not shadow existing
 operators.
 Legal operators(those prefixed by a colon) act normally when surrounded by
 parens

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9217#comment:1>
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