Brian Hurt <bhurt@janestcapital.com> wrote in article <47275E10.4070705@janestcapital.com> in gmane.comp.lang.caml.inria:
> Not sure how well this would work, but my idea would be to map the 
> concepts onto the standard code concepts. [...]

I guess the issue then boils down to how to teach higher-kinded
polymorphism, that is, functions that are polymorphic over a type
*constructor*.  It is crucial for me that the functor's argument module
contain an abstract type *constructor*.

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One can show you aren't immediately killed by tidal forces once crossing
over the event horizon of Black Hole. Mathematically, your space coordinates
become time-like and vice versa. This causes a shift in your light
cone and your world line can never intersect with someone on the outside.