[GHC] #1874: getDirectoryContents yields "invalid argument" instead of "permission error"

[GHC]

#1874: getDirectoryContents yields "invalid argument" instead of "permission
error"
------------------------------------------------------------------+---------
 Reporter:  Orphi                                                 |          Owner:       
     Type:  bug                                                   |         Status:  new  
 Priority:  normal                                                |      Milestone:       
Component:  libraries (other)                                     |        Version:  6.8.1
 Severity:  normal                                                |       Keywords:       
 Testcase:  getDirectoryContents "C:\\System Volume Information"  |   Architecture:  x86  
       Os:  Windows                                               |  
------------------------------------------------------------------+---------
 Attempting to open a file (`readFile`, `openFile`, et al) to which you do
 not have permission yields a permission exception. However, calling
 `getDirectoryContents` on a folder to which you do not have permission
 yields an "invalid argument" exception.

 (Note that as per bug #1868, this particular exception is very hard to
 process.)

 This behaviour occurs in GHC 6.6.1 and GHC 6.8.1 running on Windows XP. (I
 think I recall it also happening in GHC 6.6 on Windows NT as well, but I
 might be imagining that part.)

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1874>
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