Documentation of Implementation-Dependent Features (ANSI and GNU Common Lisp Document)

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#### 1.5.1.2 Documentation of Implementation-Dependent Features

A conforming implementation shall be accompanied by a document that provides a definition of all implementation-defined aspects of the language defined by this specification.

In addition, a conforming implementation is encouraged (but not required) to document items in this standard that are identified as implementation-dependent, although in some cases such documentation might simply identify the item as “undefined.”