It seems that if compilation is not required, or if compilation is very fast, ghc -Rghc-timing will throw up a Floating point exception: [hdaume@hal3 timing]$ ls Timing.hs [hdaume@hal3 timing]$ cat Timing.hs module Timing where timing = undefined [hdaume@hal3 timing]$ ghc -Rghc-timing Timing.hs -c <<ghc: 9358352 bytes, Floating point exception [hdaume@hal3 timing]$ ls Timing.hi Timing.hs Timing.o [hdaume@hal3 timing]$ rm *.hi *.o [hdaume@hal3 timing]$ ghc Timing.hs -c [hdaume@hal3 timing]$ ls Timing.hi Timing.hs Timing.o [hdaume@hal3 timing]$ Am I right or is something else going on here...? -- Hal Daume III "Computer science is no more about computers | hdaume@isi.edu than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume