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6.24.2 Feature Tracking

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 threads, each of which describes a feature of the running Guile process.

Variable: *features*

A list of symbols describing available features of the 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.