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On Wed, 29 Oct 2003, Bradd W. Szonye wrote: > I've been thinking about this, and I'd rather raise an exception than > provide a failure thunk. SRFI-34 defines exceptions, and SRFI-35 style > conditions could provide information about the failure. It seems to me > that a language with sophisticated support for continuations should take > advantage of that in failure interfaces. It also simplifies call > interfaces, since you don't ever need to distinguish, "Is this procedure > a thunk or a collection datum?" Far better, IMO, to provide a way to pass in a thunk to call. If an exception is desired, a thunk can raise it. There is no incompatibility issue as there is with exceptions -- a thunk is a thunk in every scheme system. Bear