All forward control flow in RScheme is based on the if special form. This form interprets all values which are not the #f object as indicating true. Hence:
In addition, RScheme implements the standard Scheme cond, case, named let, and do.
RScheme also supports exceptions for backward control flow. See in particular handler-case and signal in the chapter on exception handling.
Although our case uses eq? tests instead of eqv?. It works out the same except on floating-point discriminants.