[GHC] #10089: feature: warn about unused data definitions (with typeclass instances)

[GHC]

#10089: feature: warn about unused data definitions (with typeclass instances)
-------------------------------------+-------------------------------------
        Reporter:  slyfox            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.4
      Resolution:                    |             Keywords:  Instances
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #3221             |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * keywords:   => Instances


-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10089#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler