Haskell program's standard output breaks down if piped through 'more'

In earlier versions of GHC (up to 6.2 I remember) I could easily pipe stdout of Haskell programs through other Shell programs. But now various applications fail, especially piping through 'more'. ('less' makes no problems.)

$ ghci
...
Prelude> :! ls -al /usr/lib/ghc-6.4.1/ | more
insgesamt 88869
drwxr-xr-x    6 root root     2880 2006-09-03 12:13 .
drwxr-xr-x  111 root root    35200 2006-10-28 18:21 ..
-rwxr-xr-x    1 root root    42808 2005-09-19 14:48 cgprof
-rwxr-xr-x    1 root root  8701804 2005-09-19 14:48 ghc-6.4.1
-rwxr-xr-x    1 root root    58773 2005-09-19 14:45 ghc-asm
-rw-r--r--    1 root root      807 2005-09-19 14:45 ghci-usage.txt
-rwxr-xr-x    1 root root   847628 2005-09-19 14:48 ghc-pkg.bin
-rwxr-xr-x    1 root root    16886 2005-09-19 14:45 ghc-split
-rw-r--r--    1 root root     2755 2005-09-19 14:45 ghc-usage.txt
-rw-r--r--    1 root root    72960 2005-09-19 14:45 HSbase_cbits.o
-rw-r--r--    1 root root  4887418 2005-09-19 14:45 HSbase.o
-rwxr-xr-x    1 root root   538124 2005-09-19 14:48 hsc2hs-bin
-rw-r--r--    1 root root  1381745 2005-09-19 14:45 HSCabal.o
-rw-r--r--    1 root root    29942 2005-09-19 14:46 HSconcurrent.o
-rw-r--r--    1 root root  1188121 2005-09-19 14:46 HSdata.o
-rw-r--r--    1 root root   493422 2005-09-19 14:46 HSfgl.o
-rw-r--r--    1 root root     1516 2005-09-19 14:46 HSGLUT_cbits.o
-rw-r--r--    1 root root   673936 2005-09-19 14:46 HSGLUT.o
-rw-r--r--    1 root root     8539 2005-09-19 14:45 HShaskell98.o
-rw-r--r--    1 root root  1875175 2005-09-19 14:45 HShaskell-src.o
-rw-r--r--    1 root root   337126 2005-09-19 14:46 HSHGL.o
Prelude> 

There are much more files after HSHGL.o, but instead of the 'more?' prompt, the command stops.

~/haskell/htam$ ./Setup.lhs build 2>&1 | more
Preprocessing library HTam-0.0...
Preprocessing executables for HTam-0.0...
Building HTam-0.0...
Chasing modules from: ArbitraryRatio,Combinatorics,Combinatorics.BellNumbers,Com
binatorics.Partitions,Combinatorics.TreeDepth,ContinuedFraction,DiscretizedFunct
ion,BinaryCards,Election,Fractal,Resistor,RndBox,StableMarriage,Digits,Recursive
Expression,SymbolicDifferentation,GNUPlot,ImageProcessing.PortableAnyMap,ImagePr
ocessing.SubpixelAntialiasing,Interpolation.CubicSpline,Interpolation.DividedDif
ference,Interpolation.NewtonPolynomial,Card,Cardinal,PeanoNumber,UnlimitedPrecis
ion,NumberTheory,Numerics.DglEuler,Numerics.Differentiation,Numerics.Fourier,Num
erics.Function,Numerics.Integration,Numerics.Mean,Numerics.Newton,Numerics.Norm,
Numerics.ODEEuler,Numerics.PiPolygonal,Numerics.RegulaFalsi,Numerics.Root,Numeri
cs.SecantMethod,Numerics.SpecialFunctions,Numerics.SpecialFunctionsSimple,Polyno
mial,ArithSumSquare,DiceVanish,DistributedDots,Equation,NumberCircle,Owl,Periodi
cSequence,SquarePair,SudokuWiki,Stochastic,CDFLifting,Useful
Skipping  Useful           ( src/Useful.hs, dist/build/Useful.o )
Skipping  Stochastic       ( src/Stochastic.hs, dist/build/Stochastic.o )
Skipping  SudokuWiki       ( src/Riddle/SudokuWiki.hs, dist/build/SudokuWiki.o )
Skipping  SquarePair       ( src/Riddle/SquarePair.hs, dist/build/SquarePair.o )
Skipping  DistributedDots  ( src/Riddle/DistributedDots.hs, dist/build/Distribut
edDots.o )
Skipping  DiceVanish       ( src/Riddle/DiceVanish.hs, dist/build/DiceVanish.o )
~/haskell/htam$

There are much more modules after DiceVanish, but the output stops silently.

~/haskell/htam$ darcs changes | more
Sat Jul 29 14:27:34 CEST 2006  haskell@henning-thielemann.de
  * BinaryCards: latex output

Tue Jun 20 16:50:46 CEST 2006  haskell@henning-thielemann.de
  * new module Numerics.Mean various means

Wed Jun  7 19:20:38 CEST 2006  haskell@henning-thielemann.de
  * Setup: use Cabal's rawSystemVerbose instead of System.Cmd.rawSystem

Wed Jun  7 19:18:23 CEST 2006  haskell@henning-thielemann.de
  * SquarePairs: added new solution based on List monad

Wed Jun  7 19:17:44 CEST 2006  haskell@henning-thielemann.de
  * Useful: new iterateLimitM

Sun Jun  4 17:05:25 CEST 2006  haskell@henning-thielemann.de
  * Useful: splitLast added

Sun Jun  4 17:04:55 CEST 2006  haskell@henning-thielemann.de
  * Card, Cardinal: removed unnecessary checks for negativity

Sun Jun  4 17:03:51 CEST 2006  haskell@henning-thielemann.de
~/haskell/htam$

There are much more patches, but the output stops silently, again.

Trac metadata

Trac field	Value
Version	6.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
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Operating system
Architecture