[GHC] #9244: Compiler could warn about type variable shadowing, and hint about ScopedTypeVariables

[GHC]

#9244: Compiler could warn about type variable shadowing, and hint about
ScopedTypeVariables
-------------------------------------+-------------------------------------
        Reporter:  stusmith          |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #1316, #3691,     |  Differential Rev(s):
  #11438, #10581, #11539             |
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * related:  #1316, #3691, #11438,10581 => #1316, #3691, #11438, #10581,
     #11539


Comment:

 #11539 requests to warn about missing forall when `-XScopedTypeVariables`
 is on.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9244#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler