On Fri, 11 Nov 2005, Lukasz Stafiniak wrote:

> Dear list,
>
> Why does the sequence operator (;) have type 'a -> 'b -> 'b and not
> unit -> 'a -> 'a? There is (ignore) for doing "these things"
> purposefully. The toplevel warning is very often mute. Together with
> labels, this is a source of bugs.

You can use the Camlp4 pa_ru.cmo module which adds type constraints in 
sequences, and is mentioned there:
http://caml.inria.fr/pub/docs/manual-camlp4/manual002.html

So something like that should work:
   ocamlopt -pp 'camlp4o pa_ru.cmo' yourfile.ml


Martin

--
Martin Jambon, PhD - http://martin.jambon.free.fr