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(librep.info)Autoload Forms

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Autoload Forms
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   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 Note: Autoloading.