Brandon S. Allbery KF8NH wrote:
On 2009 Feb 20, at 4:38, Serge D. Mechveliani wrote:
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?
The ghc runtime doesn't flush stdout when an exception stops the
program. This is arguably a bug in the runtime; if you set stdout to
line buffering or no buffering you should get pretty much the same
output from both. (It's still possible for buffering to cause lines to
come out in a different order, so you might prefer unbuffered).
stdout should be flushed when the program exits, regardless of whether it
exits as a result of a clean exit or an exception. I've just checked the
code, and that's certainly what is supposed to happen. If anyone has
evidence to the contrary, please submit a bug report!
Cheers,
Simon
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