I have just discovered another minor fault in the revised Haskell'98 Report. In the definition of the Standard Prelude, (page 115) instance Read Float where readsPrec p = readFloat instance Read Double where readsPrec p = readFloat are incorrect because they do not deal with a leading minus sign. The correct versions are: instance Read Float where readsPrec p = readSigned readFloat instance Read Double where readsPrec p = readSigned readFloat Funnily enough, all the implementations seem to have this fix already, it is just the Report that gets it wrong! Regards, Malcolm