When interpreting the following four-line program using
GHCi on Windows, GHCi hangs, never completing
compilation and giving no output:
data Paradox = Roll (Paradox -> Int)
unroll (Roll x) = x
selfapply x = unroll x x
uhoh = selfapply (Roll selfapply)
If I add a simple main method of the form 'main = do
print (fst ("Hello world", uhoh))', and then compile
with GHC, it hangs as well. However, if I use a main
method which does not mention uhoh, such as 'main = do
print "Hello world"', and then compile with GHC,
compilation is successful. However, in this case,
compilation with GHCi still hangs.
As it happens, I have seen this bug in both versions
6.4 and 6.4.1 of GHC for Windows.
-Sridhar Ramesh, email@example.com
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