Re: pointer arithmetics and casts

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        BINOP[+]
                <tree for p>
                BINOP[*]
                        IMPLICIEDT_CAST[ptrdiff_t]
                                <tree for i>
                        VAL[sizeof(*p)]

I don't think you want ptrdiff_t there.  It isn't guaranteed to
be big enough.

size_t should do, though.

M.
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