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5.7.2.4 Autoload Forms

Not all parts of Librep are needed at once, autoload forms provide a means of marking that a function (or macro) is contained by a specific Lisp library. The first time that the function is accessed the autoload form will be evaluated; this loads the file containing the function, then re-evaluates the original form. By then the autoload form will have been overwritten in the symbol’s function slot by the true function (when it was loaded) so the form will execute properly.

For more details see Autoloading.