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Article contents:== Outdated CHICKEN release This is a manual page for an old and unsupported version of CHICKEN. If you are still using it, please consider migrating to the latest version. You can find the manual for the latest release [[/manual|here]]. [[tags: manual]] == Confirmed deviations Identifiers are by default case-sensitive (see [[Using the compiler]]). === Number of arguments to procedures and macros The maximal number of arguments that may be passed to a compiled procedure or macro is limited to around 1000. Likewise, the maximum number of values that can be passed to continuations captured using {{call-with-current-continuation}} is 1000. This is an implementation restriction that is unlikely to be lifted. === {{numerator}}, {{denominator}} and {{rationalize}} The {{numerator}} and {{denominator}} procedures cannot be applied to inexact numbers, and the procedure {{rationalize}} is not implemented at all. === Numeric string-conversion considerations The runtime system uses the numerical string-conversion routines of the underlying C library and so does only understand standard (C-library) syntax for floating-point constants. Consequently, the procedures {{string->number}}, {{read}}, {{write}}, and {{display}} do not obey read/write invariance to inexact numbers. === Environments and non-standard syntax In addition to the standard bindings {{scheme-report-environment}} and {{null-environment}} contain additional non-standard bindings for the following syntactic forms: {{import}}, {{require-extension}}, {{require-library}}, {{begin-for-syntax}}, {{export}}, {{module}}, {{cond-expand}}, {{syntax}}, {{reexport}}, {{import-for-syntax}}. == Unconfirmed deviations === {{char-ready?}} The procedure {{char-ready?}} always returns {{#t}} for terminal ports. == Doubtful deviations === {{letrec}} {{letrec}} does evaluate the initial values for the bound variables sequentially and not in parallel, that is: <enscript highlight="scheme"> (letrec ((x 1) (y 2)) (cons x y)) </enscript> is equivalent to <enscript highlight="scheme"> (let ((x (void)) (y (void))) (set! x 1) (set! y 2) (cons x y) ) </enscript> where R5RS requires <enscript highlight="scheme"> (let ((x (void)) (y (void))) (let ((tmp1 1) (tmp2 2)) (set! x tmp1) (set! y tmp2) (cons x y) ) ) </enscript> It is unclear whether R5RS permits this behavior or not; in any case, this only affects letrecs where the bound values are not lambda-expressions. == Non-deviations that might surprise you === {{let-syntax}} and {{letrec-syntax}} {{let-syntax}} and {{letrec-syntax}} introduce a new scope. === {{equal?}} compares all structured data recursively {{equal?}} compares all structured data with the exception of procedures recursively, while R5RS specifies that {{eqv?}} is used for data other than pairs, strings and vectors. However, R5RS does not dictate the treatment of data types that are not specified by R5RS === No built-in support for bignums There is no built-in support for exact rationals, complex numbers or extended-precision integers (bignums). The routines {{complex?}}, {{real?}} and {{rational?}} are identical to the standard procedure {{number?}}. The procedures {{make-rectangular}} and {{make-polar}} are not implemented. Fixnums are limited to 2^<nowiki>³⁰</nowiki> (or 2^<nowiki>⁶²</nowiki> on 64-bit hardware). Support for the full numeric tower is available as a separate package (see the {{numbers}} package). === {{transcript-on}} and {{transcript-off}} are not implemented The {{transcript-on}} and {{transcript-off}} procedures are not implemented. R5RS does not require them. --- Previous: [[The R5RS standard]] Next: [[Extensions to the standard]] Description of your changes:

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