On Fri, 2004-12-17 at 12:10, Jacques Garrigue wrote:

> > type empty = [ ]

> Maybe this should be a typing error rather than a syntactic one, to
> make the intention clearer.

> Empty sum types are not allowed, because, while they are not really
> dangerous, they may delay type errors.

How about: make it an error, unless -rectypes is specified.
In that case allow it. (Seems sensible to allow three cases:
(a) error (b) warning (c) no warning .. but I can't think
of how to provide that ..)

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