[GHC] #8888: Document Coercible in user's guide

[GHC]

#8888: Document Coercible in user's guide
-------------------------------------+------------------------------------
        Reporter:  goldfire          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Documentation     |          Version:  7.8.1-rc2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
-------------------------------------+------------------------------------

Comment (by Joachim Breitner <mail@…>):

 In [changeset:"1e36a386042248523de69ad6b02c43a6631ed5d0/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1e36a386042248523de69ad6b02c43a6631ed5d0"
 Document Coercible in the user guide

 as a subsection of "Equality constraints", containing references to the
 module's haddock and to the paper. Fixes #8888
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8888#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler