Hi all, I too basically agree with Andres's points and Richard's summary. But there are a fair few existing extensions, and they are not all equally compelling or urgent. (Just to exemplify, multi-parameter type classes (which in practice necessitates functional dependencies or broadly equivalent functionality) and GADTs have been mentioned to me as particularly urgent a fair few times.) So, with risk of stating the obvious, a bit of care is needed to decide just which existing extensions should be at the top of the agenda. Best, /Henrik -- Henrik Nilsson School of Computer Science The University of Nottingham nhn@cs.nott.ac.uk This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.