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Article contents:[[tags: manual]] == Confirmed deviations from R5RS 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. === Numeric string-conversion considerations In some cases the runtime system uses the numerical string-conversion routines of the underlying C library. Consequently, the procedures {{string->number}}, {{read}}, {{write}}, and {{display}} do not obey read/write invariance for 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}}. === Assignment to unbound variables {{set!}} may assign values to unbound variables; this creates a new top-level binding for the variable, as if {{define}} had been used instead. This extension must be used with care, as typos might cause unexpected results: <enscript highlight="scheme"> > (let ((frob 5)) (set! frov (+ frob 1)) ; oops! frob) > 5 > frov > 6 </enscript> == 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 === {{transcript-on}} and {{transcript-off}} are not implemented The {{transcript-on}} and {{transcript-off}} procedures are not implemented. R5RS does not require them. --- Previous: [[Using the compiler]] Next: [[Extensions to the standard]] Description of your changes:

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