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Article contents:[[tags: manual]] == Confirmed deviations from R7RS 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 == 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 R7RS specifies that {{eqv?}} is used for data other than pairs, strings and vectors. However, R7RS does not dictate the treatment of data types that are not specified by R7RS --- Previous: [[Using the compiler]] Next: [[Extensions to the standard]] Description of your changes:

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