The function parse-declarations returns a declaration-env that describes the declaration specifiers in declarations-or-specifiers. This declaration-env can be used to manipulate the declaration specifiers in various high-level ways, and finally to construct actual specifiers again.
If nostrip is true, declarations-or-specifiers should be a list of declaration specifiers rather than declarations.
Signals an error of type
TYPE-ERROR if the (implicit)
specifiers in declarations-or-specifiers are not valid declaration specifiers.
The set of understood declaration specifiers can be extended by adding methods to the generic functions analyze-declaration-specifier and build-declaration-specifier.