[GHC] #12390: List rules for `Coercible` instances

[GHC]

#12390: List rules for `Coercible` instances
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  tellah
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  ghci059
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3634
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"905dc8bc74bebf5370eb9237cc8756cd9fe871ae/ghc" 905dc8b/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="905dc8bc74bebf5370eb9237cc8756cd9fe871ae"
 Make ':info Coercible' display an arbitrary string (fixes #12390)

 This change enables the addition of an arbitrary string to the output of
 GHCi's ':info'. It was made for Coercible in particular but could be
 extended if desired.

 Updates haddock submodule.

 Test Plan: Modified test 'ghci059' to match new output.

 Reviewers: austin, bgamari

 Reviewed By: bgamari

 Subscribers: goldfire, rwbarton, thomie

 GHC Trac Issues: #12390

 Differential Revision: https://phabricator.haskell.org/D3634
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12390#comment:11>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler