[GHC] #12565: unhelpful error message about enabling TypeApplications

[GHC]

#12565: unhelpful error message about enabling TypeApplications
-------------------------------------+-------------------------------------
           Reporter:  mauke          |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 {{{
 % cat bug.hs
 }}}
 {{{#!hs
 {-# LANGUAGE TypeApplications #-}
 main = return (id@() ())
 }}}
 {{{
 % ghc bug.hs
 [1 of 1] Compiling Main             ( bug.hs, bug.o )

 bug.hs:2:16: error:
     Pattern syntax in expression context: id@()
     Did you mean to enable TypeApplications?
 }}}

 This error message makes no sense because `TypeApplications` is already
 enabled.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12565>
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