# SRFI 31: A special form rec' for recursive evaluation

by Mirko.Luedde@Computer.Org

status: final (2002/12/2)

## Abstract

We propose the implementation of a special form called rec. This form is a generalization and combination of the forms rec and named-lambda of [Clinger1985]. It allows the simple and non-imperative construction of self-referential expressions. As an important special case, it extends the A. Church form lambda such that it allows the direct definition of recursive procedures without using further special forms like let or letrec, without using advanced constructions like the H. B. Curry combinator and, unlike define`, without introducing variable bindings into the external environment.