The following functions provide ancillary capabilities for generic
function methods.
12.15.1 Getting the List of Defgenerics
12.15.3 Getting the List of Defmethods
12.15.4 Type Determination
12.15.5 Existence of Shadowed Methods
12.15.6 Calling Shadowed Methods
12.15.7 Calling Shadowed Methods with Overrides
12.15.8 Calling a Specific Method
12.15.9 Getting the Restrictions of Defmethods