]> Hi, On Wed, Jan 21, 2009 at 11:11:14AM -0800, Dario Teixeira wrote: > So my question is whether it > is at all possible to emulate GADTs using only PV + phantom types, or if on the > contrary one needs to use the object system in these cases, as exemplified by > solution c). In other words, is solution a) futile, or did you use the object > system in solution c) simply because you were also using regular variants? I didn't followed the thread closely, but did you have a look at Ocsigen's way to implement params_type? http://ocsigen.org/trac/browser/server/ocsigen.ml?rev=183 (from line 146) I don't know what it's worth, but anyway it uses only PV (and Obj.magic). Regards, -- Gabriel Kerneis