In article <wkbszqvh21.fsf@double.co.nz>, Chris Double <chris@double.co.nz> wrote: > Try: > > with-stack-structure(f :: <Foo*>) > bar(f, 5) := 0; > end; > Thanks, Chris. You are correct. I worked it out independently by the error messages. I hope that documentation on this subject is added to the Functional Developer FFI docs for the benefit of new users. Sent via Deja.com http://www.deja.com/ Before you buy.