[GHC] #9844: Bang pattern doesn't work on a newtype constructor

[GHC]

#9844: Bang pattern doesn't work on a newtype constructor
-------------------------------------+-------------------------------------
              Reporter:  akio        |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Incorrect   |       Blocked By:
  result at runtime                  |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"227a566851f19f5a720c4a86fdb1ff99117325c6/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="227a566851f19f5a720c4a86fdb1ff99117325c6"
 Don't discard a bang on a newtype pattern (Trac #9844)

 We were wrongly simply dropping the bang, in tidy_bang_pat.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9844#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler