[GHC] #10756: Allow users to indicate inaccessible patterns

[GHC]

#10756: Allow users to indicate inaccessible patterns
-------------------------------------+-------------------------------------
        Reporter:  edsko             |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by simonpj):

 A binding `foo = bar` is already regarded as a function binding in GHC.
 From `HsBinds`:
 {{{
   = -- | FunBind is used for both functions   @f x = e@
     -- and variables                          @f = \x -> e@
     --
     -- Reason 1: Special case for type inference: see
 'TcBinds.tcMonoBinds'.
     --
     -- Reason 2: Instance decls can only have FunBinds, which is
 convenient.
     --           If you change this, you'll need to change e.g.
 rnMethodBinds
     --
     -- But note that the form                 @f :: a->a = ...@
     -- parses as a pattern binding, just like
     --                                        @(f :: a -> a) = ... @
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10756#comment:13>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler