I&#39;m trying to see if this is reproducible, or it&#39;s just my machine.<div>I&#39;m on a MacBook Pro (15-inch, Mid 2012), OS X 10.8.2, Haskell Platform 2012.4.0.0 (32 bit):</div><div><br></div><div><div>$ ghci</div><div>
GHCi, version 7.4.2: <a href="http://www.haskell.org/ghc/">http://www.haskell.org/ghc/</a>  :? for help</div><div>Loading package ghc-prim ... linking ... done.</div><div>Loading package integer-gmp ... linking ... done.</div>
<div>Loading package base ... linking ... done.</div><div>Prelude&gt; properFraction (-1.1 :: Float)</div><div>(-1,-0.100000024)</div><div><div>Prelude&gt; properFraction (1.1 :: Double)</div><div>(1,0.10000000000000009)</div>
</div><div>Prelude&gt; properFraction (-1.1 :: Double)</div><div>(-1,Segmentation fault: 11</div></div><div><br></div><div>&#39;ceiling&#39; and other code that uses properFraction segfaults on negative doubles, too.</div>
<div><br></div><div>Compiled code doesn&#39;t have this defect.  I&#39;m going to try the 64 bit version to see if it resolves this problem.</div><div><br></div><div><br></div><div>-Ron Alford</div>