I've written some simple macros for accessing options in ocaml, and I
want to double check that they are actually right.  Does this look
right?  And is this documented anywhere?

#define Is_None(v)  (Is_long(v))
#define Is_Some(v)  (!Is_None(v))
#define Some_val(v) (Field(v,0))

Thanks,
Yaron

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