- (ERR-ORS (<caller> <expression> ...) ...)procedure
- Each <variable> should be an argument of a procedure.
- The <caller>, <expr>, and <expression> are any scheme expressions, but the <expr> should contain the corresponding <variable>.
ARG-AND, ARG-ANDS, ERR-AND, and ERR-ANDS are the same as AND except that these signal an error in case AND returns a false value.
ARG-OR, ARG-ORS, ERR-OR, and ERR-ORS are the same as OR except that these signal an error in case OR returns a true value.