[GHC] #14730: Missing predicate for "ResourceVanished" IOException/IOErrorType

[GHC]

#14730: Missing predicate for "ResourceVanished" IOException/IOErrorType
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        Reporter:  bit               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by vdukhovni):

 In addition, it would be really cool if the "ioe_errno" value were
 accessible, at least as a number so it could be logged.

 While the associated C macro names are not all available on every
 platform, and any mapping to symbolic Haskell names would be unavoidably
 incomplete, a more ambitious interface might define any missing macros
 (that are common enough on most platforms to be supported) to 0 on
 platforms that lack that macro, and then a newtype + a set of
 PatternSynonyms would provide a usable Enum-like interface.  As in the
 "Errno.hsc" example.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14730#comment:3>
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