2.14 Automatic loading of libraries
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Availability:built-in
Sourceautoload_path(+DirAlias)
Add DirAlias to the libraries that are used by the autoloader. This extends the search path autoload and reloads the library index. For example: 
:- autoload_path(library(http)).

If this call appears as a directive, it is term-expanded into a clause for user:file_search_path/2 and a directive calling reload_library_index/0. This keeps source information and allows for removing this directive.