[GHC] #12579: Allowed to create non-alphanumeric data / newtype constructor that cannot be used

[GHC]

#12579: Allowed to create non-alphanumeric data / newtype constructor that cannot
be used
-------------------------------------+-------------------------------------
           Reporter:  Iceland_jack   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I can't remember if this had been filed before but this is present in both
 7.8.4 and 8.0.1:

 {{{
 Prelude> newtype A = (****) Int
 }}}

 There is no way to use the constructor `****`:

 {{{
 Prelude> :i A
 newtype A = **** Int    -- Defined at <interactive>:3:1
 Prelude> :i ****

 Top level: Not in scope: ‘****’
 Prelude> :t (****)

 <interactive>:1:1: Not in scope: ‘****’
 Prelude>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12579>
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