[GHC] #1873: ghci loses pre-error context after :reload

[GHC]

#1873: ghci loses pre-error context after :reload
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 Reporter:  claus    |          Owner:         
     Type:  bug      |         Status:  new    
 Priority:  normal   |      Milestone:         
Component:  GHCi     |        Version:  6.9    
 Severity:  normal   |       Keywords:         
 Testcase:           |   Architecture:  Unknown
       Os:  Unknown  |  
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 when trying to `:reload` an erroneous source, the ghci context changes
 back to `Prelude>`. however, if one fixes the source, then does `:reload`
 again, older ghcis ended back in the source context, while current head
 ghci stay in `Prelude>`.

 i attach a session log demonstrating the issue.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1873>
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