Thanks for the comments. Indeed I knew the solution -
once I isolated the problem.
Note that ghc(i) behaves differently when running main2 below
(it says "file is locked"). (hugs does not complain.)
import System
main1 = do
system "echo A > foo"
a <- readFile "foo"
system "echo B > foo"
b <- readFile "foo"
print (a == b)
main2 = do
writeFile "foo" "A"
a <- readFile "foo"
writeFile "foo" "B"
b <- readFile "foo"
print (a == b)
--
-- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 --
---- http://www.imn.htwk-leipzig.de/~waldmann/ -------
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