An implementation may provide any or all of the feature identifiers listed below for use by
cond-expandandfeatures, but must not provide a feature identifier if it does not provide the corresponding feature.
r7rs-- All R7RS Scheme implementations have this feature.
exact-closed-- All algebraic operations except/produce exact values given exact inputs.
exact-complex-- Exact complex numbers are provided.
ieee-float-- Inexact numbers are IEEE 754 binary floating point values.
full-unicode-- All Unicode characters present in Unicode version 6.0 are supported as Scheme characters.
ratios--/with exact arguments produces an exact result when the divisor is nonzero.
posix-- This implementation is running on a POSIX system.
windows-- This implementation is running on Windows.
unix,darwin,gnu-linux,bsd,freebsd,solaris, ... -- Operating system flags (perhaps more than one).
i386,x86-64,ppc,sparc,jvm,clr,llvm, ... -- CPU architecture flags.
ilp32,lp64,ilp64, ... -- C memory model flags.
big-endian,little-endian-- Byte order flags.
<name>-- The name of this implementation.
<name-version>-- The name and version of this implementation.
The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.