[GHC] #8581: Pattern synonym used in an expression context could have different constraints to pattern used in a pattern context

[GHC]

#8581: Pattern synonym used in an expression context could have different
constraints to pattern used in a pattern context
-------------------------------------+-------------------------------------
        Reporter:  cactus            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
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 Ben Gamari <ben@…>):

 In [changeset:"471a992ab956fe90d51b875a81d6963592db5553/ghc" 471a992/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="471a992ab956fe90d51b875a81d6963592db5553"
 Trac #8581 users_guide/glasgow_exts section 10.7

 as per comments on the ticket; also linked to Haskell folk art of 'Smart
 constructors'.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8581#comment:55>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler