[GHC] #12898: Upgrade Stack failed

[GHC]

#12898: Upgrade Stack failed
----------------------------------------+----------------------------
           Reporter:  Bugger            |             Owner:
               Type:  bug               |            Status:  new
           Priority:  normal            |         Milestone:
          Component:  Compiler          |           Version:  8.0.1
           Keywords:                    |  Operating System:  MacOS X
       Architecture:  Unknown/Multiple  |   Type of failure:  Other
          Test Case:                    |        Blocked By:
           Blocking:                    |   Related Tickets:
Differential Rev(s):                    |         Wiki Page:
----------------------------------------+----------------------------
 (Please note that I am new here and not sure whether it is the right place
 to post this...)
 I was trying to do stack upgrade via shell and received following output
 (cf. attachement):
 As it links here with
 "Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug"
 I will just post it.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12898>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler