[GHC] #3229: queued GHCi commands are not resume context specific

[GHC]

#3229: queued GHCi commands are not resume context specific
-----------------------------+----------------------------------------------
Reporter:  phercek           |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  GHCi            
 Version:  6.10.3            |       Severity:  normal          
Keywords:  debugger          |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 I think it is a bug that the second part ({{{:continue}}}) of the command
 {{{:cmd return "rv\n:continue"}}} is executed in a different context than
 the first part (rv (request for the value of rv variable)). Notice that we
 did not stop at breakpoint 1 (line 7). Well, the stop happened but it
 continued immediately because of queued {{{:continue}}} command. But the
 command was queued in the context of breakpoint 0 and not breakpoint 1.
 {{{
 status:0 peter at metod [716] ~/tmp
 % grep -n '^' b.hs
 1:fn :: Int -> Int
 2:fn x =
 3:  let rv = add x 1 in
 4:  rv
 5:
 6:add :: Int -> Int -> Int
 7:add a b = a + b
 status:0 peter at metod [717] ~/tmp
 % ghci b.hs
 GHCi, version 6.10.1: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer ... linking ... done.
 Loading package base ... linking ... done.
 [1 of 1] Compiling Main             ( b.hs, interpreted )
 Ok, modules loaded: Main.
 *Main> :set stop :list
 *Main> :break 4
 Breakpoint 0 activated at b.hs:4:2-3
 *Main> :break 7
 Breakpoint 1 activated at b.hs:7:0-14
 *Main> fn 100
 Stopped at b.hs:4:2-3
 _result :: Int = _
 rv :: Int = _
 3    let rv = add x 1 in
 4    rv
 5
 [b.hs:4:2-3] *Main> :cmd return "rv\n:continue"
 Stopped at b.hs:7:0-14
 _result :: Int = _
 6  add :: Int -> Int -> Int
 7  add a b = a + b
 8
 101
 [b.hs:4:2-3] *Main> :continue
 101
 *Main> :q
 Leaving GHCi.
 status:0 peter at metod [718] ~/tmp
 %
 }}}
 The log was done with 6.10.1 but it is the same with 6.10.3.[[BR]]
 I posted about this to the ghc users list about 2 months ago but nobody
 responded. My guess is nobody minds either way since nobody scripts
 breakpoints. At least it would be fine to know whether a patch fixing this
 has a chance to be accepted.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3229>
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