[GHC] #13075: Top-level bang pattern accepted

[GHC]

#13075: Top-level bang pattern accepted
-------------------------------------+-------------------------------------
           Reporter:  goldfire       |             Owner:  goldfire
               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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 When I compile/link

 {{{#!hs
 {-# LANGUAGE BangPatterns #-}

 module Main where

 !(Just x) = Nothing

 main = putStrLn "hi there!"
 }}}

 I get

 {{{
 rae:09:50:49 ~/temp> ghc Bug.hs
 [1 of 1] Compiling Main             ( Bug.hs, Bug.o )
 Linking Bug ...
 ld: can't open output file for writing: Bug, errno=21 for architecture
 x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 `gcc' failed in phase `Linker'. (Exit code: 1)
 }}}

 This bogus code should be rejected more gracefully (and earlier). It
 actually also loads into GHCi, but shouldn't.

 Will fix while I'm in the area.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13075>
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