W li¶cie z ¶ro, 07-04-2004, godz. 08:01 +0200, Nicolas Cannasse napisa³:

> >   val g : unit -> int
> >   let f () = g ()
> >   let x = f ()
> >   let y = x + 1
> >   let g () = y
> 
> What about "compilation error : recursive calls in forward declaration" ?

At which point? What are the correctness criteria in general?

For forward declarations to be useful, they would need to give something
more than let rec. But I don't see a safe subset which is larger than
let rec and doesn't need runtime checking.

(In my language something like the above is legal, even without a
forward declaration. Using g from f does a runtime check that the
definition of g has been already executed. The check is avoided in cases
it's easy to be proven unnecessary, e.g. with mutual recursion between
successive function definitions.)

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak@knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/


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