This site is a static rendering of the Trac instance that was used by R7RS-WG1 for its work on R7RS-small (PDF), which was ratified in 2013. For more information, see Home.

Source for wiki EmptyList version 4

author

cowan

comment

ipnr

127.11.51.1

name

EmptyList

readonly

text

The empty list is self-evaluating in Gauche, MIT, Kawa, SISC, Chibi,
SCM, NexJ, STklos, !SigScheme, !TinyScheme, Scheme 9, Dream, S7, BDC,
Xlisp, Rep, Jscheme, Schemik, VX, Oaklisp, Sizzle, Spark, Femtolisp, Dfsch, Inlab, Owl Lisp, Sagittarius.

Racket, Gambit, Chicken, Bigloo, Guile, Scheme48/scsh, Chez, !Ikarus/Vicare, Larceny, Ypsilon, Mosh, !IronScheme, KSi, Shoe, Elk, RScheme, UMB, Llava, SXM,  signal a syntax error.

Larceny signals a syntax warning but then treats the empty list as self-evaluating.

In XLisp, Rep, VX, `(car '())` and `(cdr '())` evaluate to the empty list, as in Common Lisp.

time

2014-12-28 08:28:57