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Extensions to the standard
Identifiers
Identifiers may contain special characters if delimited with | ... |.
Brackets and braces
The brackets [ ... ] and the braces { ... } are provided as an alternative syntax for ( ... ). A number of reader extensions is provided. See Non-standard read syntax.
Non-standard macros
Numerous non-standard macros are provided. See Non-standard macros and special forms for more information.
Non-standard procedures
CHICKEN provides numerous non-standard procedures. See the manual sections on library units for more information.
User defined character names
User defined character names are supported. See char-name. Characters can be given in hexadecimal notation using the #\xXX syntax where XX specifies the character code. Character codes above 255 are supported and can be read (and are written) using the #\uXXXX and #\UXXXXXXXX notations.
Non-standard characters names supported are #\tab, #\linefeed, #\return, #\alarm, #\vtab, #\nul, #\page, #\esc, #\delete and #\backspace.
Special characters in strings
CHICKEN supports special characters preceded with a backslash \ in quoted string constants. \n denotes the newline-character, \r carriage return, \b backspace, \t TAB, \v vertical TAB, \a alarm, \f formfeed, \xXX a character with the code XX in hex and \uXXXX (and \UXXXXXXXX) a unicode character with the code XXXX. The latter is encoded in UTF-8 format.
The third argument to substring is optional and defaults to the length of the string.
exit
The exit procedure exits a program right away and does not invoke pending dynamic-wind thunks.
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