Hi Hat and Yhc people (and I guess nhc people as well), Both GHC and Hugs parse 1e12 as a number, but Hat and Yhc don't. For example, test = print 1e12 gives: yhc: -- during when renaming Error: Identifier e12 used at 7:15-7:17 is not defined. I have also been told that Hat leads to an error. So: 1) Is this an error, what does the Haskell spec say? 2) Should the parser be fixed in all the right places? (does this impact Colin's hpc as well?) Thanks Neil