## Function: COMMON-LISP:REQUIRE
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> Loads a module, unless it already has been loaded. PATHNAMES, if supplied,
> is a designator for a list of pathnames to be loaded if the module
> needs to be. If PATHNAMES is not supplied, functions from the list
> *MODULE-PROVIDER-FUNCTIONS* are called in order with MODULE-NAME
> as an argument, until one of them returns non-NIL.  User code is
> responsible for calling PROVIDE to indicate a successful load of the
> module.

### Lambda list
```cl
(sb-impl::module-name &optional sb-impl::pathnames)
```