(guile.info.gz) SRFI-31

 
 39.16 SRFI-31 - A special form `rec' for recursive evaluation
 =============================================================
 
 SRFI-31 defines a special form that can be used to create
 self-referential expressions more conveniently.  The syntax is as
 follows:
 
      <rec expression> --> (rec <variable> <expression>)
      <rec expression> --> (rec (<variable>+) <body>)
 
    The first syntax can be used to create self-referential expressions,
 for example:
 
        guile> (define tmp (rec ones (cons 1 (delay ones))))
 
    The second syntax can be used to create anonymous recursive
 functions:
 
        guile> (define tmp (rec (display-n item n)
                             (if (positive? n)
                                 (begin (display n) (display-n (- n 1))))))
        guile> (tmp 42 3)
        424242
        guile>

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