[GHC] #14333: GHC doesn't use the fact that Coercible is symmetric

[GHC]

#14333: GHC doesn't use the fact that Coercible is symmetric
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:  TypeFamilies,
                                     |  Roles
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14323            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * related:   => #14323


Comment:

 Commit 5a66d574890ed09859ca912c9e0969dba72f4a23 fixed #14323 as well, so
 if the payload of that commit is reverted, make sure to re-open #14323 as
 well.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14333#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler