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. For a version of this page that may be more recent, see LiSPTopLevels in WG2's repo for R7RS-large.

LiSPTopLevels

kumoyuki

2010-02-27 21:10:28

All information taken from Christaian Quiennic's, Lisp In Small Pieces, 1994 edition.

Universal Global Environment

Reference	x
Value	x
Modification	(set! x ...)
Extension	no
Definition	no, define == set!

Frozen Global Environment

Reference	x
Value	x, but {{{x} must exist
Modification	(set! x ...)}}}, but {{{x must exist
Extension	define (only one time)
Definition	no

Automatically Extendable Global Environment

Reference	x
Value	x
Modification	(set! x ...)
Extension	(set! x ...)
Definition	no, define == set!

Hyperstatic Global Environment

Reference	x}}}, but {{{x must exist
Value	x}}}, but {{{x must exist
Modification	(set! x ...)}}}, but {{{x must exist
Extension	define
Definition	no