[GHC] #15857: Need for better warnings arising from StarIsType extension

[GHC]

#15857: Need for better warnings arising from StarIsType extension
-------------------------------------+-------------------------------------
        Reporter:  jrp               |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:  StarIsType
                                     |  NoStarIsType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by int-index):

 I designed `-Wstar-binder` specifically for this purpose, and it is
 enabled by default.

 {{{
 Prelude> :set -XTypeOperators
 Prelude> type (*) = (,)

 <interactive>:2:7: warning: [-Wstar-binder]
     Found binding occurrence of ‘*’ yet StarIsType is enabled.
     NB. To use (or export) this operator in modules with StarIsType,
         including the definition module, you must qualify it.
 }}}

 Are you not seeing it for some reason or do you think the wording needs
 improvement?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15857#comment:2>
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