[GHC] #13421: Confusing error when using BangPatterns without pragma

[GHC]

#13421: Confusing error when using BangPatterns without pragma
-------------------------------------+-------------------------------------
        Reporter:  schyler           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
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:                    |
-------------------------------------+-------------------------------------

Comment (by schyler):

 Would be nice if it said something like "Perhaps you meant to use
 -XBangPatterns?" like it does for all the type-level errors where you
 forget to use the pragma.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13421#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler