Returns the dspec class of a dspec.
dspec
dspec-class dspec => class
A dspec.
class
A dspec class name.
The function dspec-class returns the dspec class name for dspec .
CL-USER 14 > dspec:dspec-class 'foo
FUNCTION
CL-USER 15 > dspec:dspec-class '(defmacro foo)
DEFMACRO
CL-USER 16 > dspec:dspec-class '(defmethod foo)
DEFMETHOD
dspec-name