Restrictions on Examining a Pathname Device Component (ANSI and GNU Common Lisp Document)

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#### 19.2.2.14 Restrictions on Examining a Pathname Device Component

The device might be a string, `:wild`, `:unspecific`, or nil.

Note that `:wild` might result from an attempt to read_1 the pathname component, even though portable programs are restricted from writing_1 such a component value; see Restrictions on Wildcard Pathnames and Restrictions on Constructing Pathnames.