I'm just guessing, but it looks like a buffering problem.
When a program dies an abnormal death (like the "Bug:" thing probably
is) then the stdout buffer is not flushed and you'll miss that bit of
the output.
You could set stdout in NoBuffering mode and see if that helps.
-- Lennart
On Fri, Feb 20, 2009 at 9:38 AM, Serge D. Mechveliani
People, I observe the output difference in running ./Bug and ./Bug >& log (under Linux) for the program
import Dumatel main = do calcInput <- readFile "List0.inp" (putStr $ parseComputeShow calcInput) where parseComputeShow calcInput = concat ["t = ", showsn 3 t "\n", "tR = ", showsn 3 tR "\n"] where calc = addInput_default nilParseOpts (bool rpos) calcInput t = parse_default calc "parsing Term" "(a:nil) + (b:nil)" tR = evaluate emptyUMRMemo AllRules calc t
-- I think, it can be reduced to much simpler one. The error break has to occur while computing tR. The difference is in printing or skipping of the result part before tR. The first command outputs
--------------------------------- t = ((a : nil) + (b : nil)) Bug: substitute {(X, a), (Xs, nil), (Ys, (b : nil))} X: sort mismatch in substitution ---------------------------------
And the second command skips (in ./log) the line of t = ... Who can tell what is the matter? How to have identic outputs in this example?
Thank you in advance for explanation.
----------------- Serge Mechveliani mechvel@botik.ru
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