#3165: :history throws "Irrefutable pattern failed" exception
---------------------------+------------------------------------------------
  Reporter:  greenrd       |          Owner:  igloo 
      Type:  bug           |         Status:  patch 
  Priority:  normal        |      Milestone:  6.12.1
 Component:  GHCi          |        Version:  6.10.2
Resolution:                |       Keywords:        
  Testcase:                |      Blockedby:        
Difficulty:  Unknown       |             Os:  Linux 
  Blocking:                |   Architecture:  x86   
   Failure:  None/Unknown  |  
---------------------------+------------------------------------------------
Changes (by igloo):

 * cc: mnislaih (added)


Comment:

 This makes hist001 fail; is the new output OK?:
 {{{
 =====> hist001(ghci) 72 of 74 [0, 0, 0]
 cd . && HC='/home/ian/ghc/darcs/ghc/inplace/bin/ghc-stage2' HC_OPTS
 ='-dcore-lint
  -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  '
 '/home/ian/ghc/d
 arcs/ghc/inplace/bin/ghc-stage2' --interactive -v0 -ignore-dot-ghci
 -dcore-lint
 -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts   -ignore-dot-
 ghci
  <hist001.script >hist001.run.stdout 2>hist001.run.stderr
 Actual stdout output differs from expected:
 --- ./hist001.stdout.normalised 2010-11-21 18:48:24.000000000 +0000
 +++ ./hist001.run.stdout.normalised     2010-11-21 18:48:24.000000000
 +0000
 @@ -1,15 +1,15 @@
  Breakpoint 0 activated at ../Test3.hs:1:14-15
  [2,3Stopped at ../Test3.hs:1:14-15
  _result :: [a] = _
 --1  : mymap (../Test3.hs:(1,1)-(2,31))
 +-1  : (../Test3.hs:(1,1)-(2,31))
  -2  : mymap (../Test3.hs:2:22-31)
  -3  : mymap (../Test3.hs:2:18-20)
  -4  : mymap (../Test3.hs:2:18-31)
 --5  : mymap (../Test3.hs:(1,1)-(2,31))
 +-5  : (../Test3.hs:(1,1)-(2,31))
  -6  : mymap (../Test3.hs:2:22-31)
  -7  : mymap (../Test3.hs:2:18-20)
  -8  : mymap (../Test3.hs:2:18-31)
 --9  : mymap (../Test3.hs:(1,1)-(2,31))
 +-9  : (../Test3.hs:(1,1)-(2,31))
  <end of history>
  Logged breakpoint at ../Test3.hs:(1,1)-(2,31)
  _result :: [a]
 *** unexpected failure for hist001(ghci)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3165#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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