[GHC] #11128: New `-fwarn-noncanonical-monad-instances` warning

[GHC]

#11128: New `-fwarn-noncanonical-monad-instances` warning
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  hvr
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1516
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by hvr):

 * status:  patch => closed
 * resolution:   => fixed


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11128#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler