pkg reflect, type Type interface, FieldByName(string) (StructField, bool)
pkg reflect, type Type interface, FieldByNameFunc(func(string) bool) (StructField, bool)
pkg reflect, type Type interface, Implements(Type) bool
pkg reflect, type Type interface, In(int) Type
pkg reflect, type Type interface, IsVariadic() bool
pkg reflect, type Type interface, Key() Type
pkg reflect, type Type interface, Kind() Kind

than the work as a whole, that (a) is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and (b) serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form.  A
"Major Component", in this context, means a major essential component