[ ghc-Bugs-1344553 ] GHC and GHCi hang when compiling simple program

Bugs item #1344553, was opened at 2005-10-31 21:40
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Category: Compiler
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: GHC and GHCi hang when compiling simple program

Initial Comment:
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, sramesh@xxxxxxxxxxxxxx

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