[GHC] #11765: Allow documentary type signatures

[GHC]

#11765: Allow documentary type signatures
-------------------------------------+-------------------------------------
        Reporter:  dfeuer            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  7.10.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 Not a bad idea; and easy to implement given syntax that everyone is happy
 with.  In SPECIALISE pragmas the type is inside the pragma, and this is a
 variant of `SPECIALISE`.

 Indeed, maybe it ''is'' `SPECIALISE`, except that GHC might notice that
 there was nothing to be gained from specialising and so discard the code
 and rule.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11765#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler