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Guile has a Scheme level variable
*features* that keeps track to
some extent of the features that are available in a running Guile.
*features* is a list of symbols, for example
of which describes a feature of the running Guile process.
You shouldn't modify the
*features* variable directly using
set!. Instead, see the procedures that are provided for this
purpose in the following subsection.
33.2.1 Feature Manipulation Checking for and advertising features. 33.2.2 Common Feature Symbols Commonly available features.
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