[GHC] #14788: `error` in GHC internals can disappear by rerunning ghc again

[GHC]

#14788: `error` in GHC internals can disappear by rerunning ghc again
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        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14533            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 > I suggest that ghc either deepseq the string to be written to the .o
 file before calling writeFile or equivalent,

 That imposes a cost on every compilation.  Maybe instead remove any `.o`
 file if a panic occurs?  That would impose costs only on the panic path.

 This would entail noting what files are "in flight", so that the exception
 handler can delete them.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14788#comment:1>
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