Void value

Does the implementation have (void) or (undefined)? What about lexical syntax for void values?

Since not all implementations display anything for a top-level void value, try (list (void)) or (list (undefined)) to ensure the value is displayed.

Implementation	Procedure	Read Syntax	Write Syntax
Chez Scheme	`(void)`	N/A	`#<void>`
Chibi-Scheme	N/A	N/A	N/A
Chicken	`(void)`	N/A	`#<unspecified>`
Cyclone	N/A	N/A	N/A
Gambit	`(void)`	`#!void`	`#!void`
Gauche	N/A	N/A	N/A
Guile	?	?	`#<unspecified>`
Kawa	N/A	`#!void`	nothing written
MIT	?	`#!unspecific`	`#!unspecific`
Mosh	?	N/A	`#<unspecified>`
Owl Lisp	N/A	N/A	N/A
Racket	`(void)`	N/A	`#<void>`
s7	N/A	N/A	N/A
Sagittarius	`(undefined)`	N/A	`#<unspecified>`
Scheme 9	`(void)`	N/A	`#<unspecific>`
STklos	`(void)`	`#void`	`#void`
TinyScheme	N/A	N/A	N/A

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