declaration-specifier—a declaration specifier; not evaluated.
Establishes the declarations specified by the declaration-specifiers.
If a use of this macro appears as a top level form in a file
being processed by the file compiler, the proclamations are also made
at compile-time. As with other defining macros, it is unspecified whether or
not the compile-time side-effects of a declaim persist after the
file has been compiled.