On 01/20/2012 01:39 PM, Mehdi Dogguy wrote: > I noticed that Alain Frisch tried to add custom let bindings (see r11894 > and r11906) but it was reverted later on (see r11960) because no > consensus was reached (among OCaml Core team, I guess).
Yes. We Caml developers spent a lot of time arguing about the merits and demerits of various syntaxes for monadic lets and other forms of generalized let bindings, discussing usability, generality, etc. There were some unexpected surprises, e.g. Lwt's concurrency monad needing a special monadic "let ... and ... in ..." binding, which makes sense for this particular monad but not for others. In the end, we decided that none of the proposals is something we can commit on and put (forever) in the core language. This is one of the cases that is currently best handled by Camlp4 syntax extensions, either specific to a monad (Lwt) or more general (pa_monad). Regards, - Xavier Leroy -- Caml-list mailing list. Subscription management and archives: https://sympa-roc.inria.fr/wws/info/caml-list Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
