Marshal stores values or data structures, a lazy value by definition 
is one whose evaluation has been deferred. In order for the marshalling
of lazy values to work, the thunk (or however deferred evaluation is 
handled in ocaml) and all the environment that it depends on would have
to be marshalled.

On Tue, 17 Jun 2003 sicard@poleia.lip6.fr wrote:

> Hello
> I don't understand the following error :
> Marshalling a lazy value don't work when the value has not been computed.
> 
> 
> # let a = lazy 0;;
> val a : int lazy_t = <lazy>
> # Marshal.to_string a [ Marshal.Closures ] ;;
> Exception: Invalid_argument "output_value: abstract value".
> 
> # Lazy.force a;;
> - : int = 0
> # Marshal.to_string a [ Marshal.Closures ] ;;
> - : string =
> "\132\149??\000\000\000\001\000\000\000\000\000\000\000\000\000\000\000\000@"
> #
> 
> Thanks
> 
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