[GHC] #10149: The argument of mask does not always restore the masking state

[GHC]

#10149: The argument of mask does not always restore the masking state
-------------------------------------+-------------------------------------
        Reporter:                    |                Owner:
  facundo.dominguez                  |  facundo.dominguez
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1327
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  patch => merge


Comment:

 Going to merge to `ghc-7.10` as well.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10149#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler