[GHC] #8772: ghci should safe history more often

[GHC]

#8772: ghci should safe history more often
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       Reporter:  nomeata                     |             Owner:
           Type:  feature request             |            Status:  new
       Priority:  normal                      |         Milestone:
      Component:  GHCi                        |           Version:  7.6.3
       Keywords:                              |  Operating System:
   Architecture:  Unknown/Multiple            |  Unknown/Multiple
     Difficulty:  Moderate (less than a day)  |   Type of failure:
     Blocked By:                              |  None/Unknown
Related Tickets:                              |         Test Case:
                                              |          Blocking:
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 It is very annoying if `ghci` crashes (due to using a foreign library
 wrongly, for example), and then the history is lost. It should be simple
 to save each line to history before it is being executed.

 Maybe a good task for new contributors?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8772>
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