> 
> - Lazy constructor and function can not be matched ... and this is ennoying
I guess there must be a reason for not matching Lazy constructor, in fact
I see no constructor in the Lazy module. Maybe I am missing something here.


> 
> I saw a post recently about lazy constructor and I can not write the
> camlp4 extension I want because of the second limitation ...
> 
> It may be not clear what I mean by matching a function (looks impossible
> ;-). I mean something like
You bet.

> 
> pattern <= expr expr expr       is a pattern
> 
> and a function f is matched by
> 
> p <= e1 ... eN      iff     f e1 ... eN is matched by p
> 
> (I do not care about the final syntax ...)

I do not get the idea either, can you be a bit more specific ?
I have more or less the feeling that

match f with
 pattern <= expr expr expr -> bonga

means

match f expr expr expr with
p -> bonga 

Thus I hardly seen your point.

--Luc Maranget