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19 Filenames 19.2 Pathnames 19.2.2 Interpreting Pathname Component Values 19.2.2.4 Restrictions on Examining Pathname Components
19.2.2.4.2 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 read1
the pathname component, even though portable programs are restricted
from writing1 such a component value;
see Section 19.2.2.3 Restrictions on Wildcard Pathnames and Section 19.2.2.5 Restrictions on Constructing Pathnames.
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