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Deviations from the standard
Identifiers are by default case-sensitive (see Compiler command line format).
[4.1.3] The maximal number of arguments that may be passed to a compiled procedure or macro is 120. A macro-definition that has a single rest-parameter can have any number of arguments.
[4.2.2] letrec does evaluate the initial values for the bound variables sequentially and not in parallel, that is:
(letrec ((x 1) (y 2)) (cons x y))
is equivalent to
(let ((x (void)) (y (void))) (set! x 1) (set! y 2) (cons x y) )
where R5RS requires
(let ((x (void)) (y (void))) (let ((tmp1 1) (tmp2 2)) (set! x tmp1) (set! y tmp2) (cons x y) ) )
[4.3] syntax-rules macros are not provided but available separately.
[6.1] equal? compares all structured data recursively, while R5RS specifies that eqv? is used for data other than pairs, strings and vectors.
[6.2.4] 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.
[6.2.5] There is no built-in support for rationals, complex numbers or extended-precision integers (bignums). The routines complex?, real? and rational? are identical to the standard procedure number?. The procedures numerator, denominator, rationalize, make-rectangular and make-polar are not implemented. Fixnums are limited to ±230 (or ±262 on 64-bit hardware). Support for extended numbers is available as a separate package, provided the GNU multiprecision library is installed.
[6.2.6] The procedure string->number does not obey read/write invariance on inexact numbers.
[6.4] The maximum number of values that can be passed to continuations captured using call-with-current-continuation is 120.
[6.5] Code evaluated in scheme-report-environment or null-environment still sees non-standard syntax.
[6.6.2] The procedure char-ready? always returns #t for terminal ports. The procedure read does not obey read/write invariance on inexact numbers.
[6.6.3] The procedures write and display do not obey read/write invariance to inexact numbers.
[6.6.4] The transcript-on and transcript-off procedures are not implemented.
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