> (scheme-report-environment 1000)
> is a more reliable way to signal an error than (car #t).

Agreed. Perhaps even better would be:
(scheme-report-environment -1)

Anyway, while looking for a reliable way to signal an error, I was
somewhat disappointed that R5RS requires so little error checking

Stephan

--
ir. Stephan H.M.J. Houben
tel. +31-40-2474358 / +31-40-2743497
e-mail: xxxxxx@win.tue.nl