[GHC] #831: GHCi user interface bug

[GHC]

#831: GHCi user interface bug
---------------------+------------------------------------------------------
 Reporter:  guest    |          Owner:         
     Type:  bug      |         Status:  new    
 Priority:  low      |      Milestone:  6.6.1  
Component:  GHCi     |        Version:  6.4.2  
 Severity:  minor    |     Resolution:         
 Keywords:           |     Difficulty:  Unknown
 Testcase:  N/A      |   Architecture:  x86    
       Os:  Windows  |  
---------------------+------------------------------------------------------
Old description:

> GHCi can do some weird things, with the letter g and the up arrow:
>
> > ghci
> ghci> :m Control.Concurrent
> ghci> threadDelay 5000000
> (now, while thread delay is running, press the up arrow once)
> (once the computation has returned, the following will be on the line)
> (i.e. you don't type threadDelay again)
> ghci> threadDelay 5000000
> (now just press enter)
>
> <interactive>:1:0: Not in scope: `ghreadDelay'
>
> This works for any computation that runs long enough for the user to
> press up while its still going. The result is always a g replacing the
> first letter - I have had gain for main etc. And the buffer always
> appears correct to visual inspection.

New description:

 GHCi can do some weird things, with the letter g and the up arrow:
 {{{
 ghci> :m Control.Concurrent
 ghci> threadDelay 5000000
 }}}
 (now, while thread delay is running, press the up arrow once)
 (once the computation has returned, the following will be on the line)
 (i.e. you don't type threadDelay again)
 {{{
 ghci> threadDelay 5000000
 }}}
 (now just press enter)
 {{{
 <interactive>:1:0: Not in scope: `ghreadDelay'
 }}}
 This works for any computation that runs long enough for the user to press
 up while its still going. The result is always a g replacing the first
 letter - I have had gain for main etc. And the buffer always appears
 correct to visual inspection.

Comment (by simonmar):

 Formatting only

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/831>
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