Alan Watson <xxxxxx@astrosmo.unam.mx> writes:

> [*] Distinguishing nulls is easy:

Any way of distinguishing nulls breaks the natural implementation of
eq? by just comparing machine words.

--
   __("<         Marcin Kowalczyk
   \__/       xxxxxx@knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/