InterfaceType struct {
		MethodList []*Field
		expr
	}

	FuncType struct {
		ParamList  []*Field
		ResultList []*Field
		expr
	}

	// map[Key]Value
	MapType struct {
		Key, Value Expr
		expr
	}

	//   chan Elem
	// <-chan Elem
	// chan<- Elem
	ChanType struct {
		Dir  ChanDir // 0 means no direction
		Elem Expr
		expr
	}
)

	{"ArrayType", `@[10]T`},
	{"ArrayType", `@[...]T`},

	{"SliceType", `@[]T`},
	{"DotsType", `@...T`},
	{"StructType", `@struct{}`},
	{"InterfaceType", `@interface{}`},
	{"FuncType", `func@()`},
	{"MapType", `@map[T]T`},

	{"ChanType", `@chan T`},
	{"ChanType", `@chan<- T`},
	{"ChanType", `@<-chan T`},
}

var fields = []test{
	{"Field", `@T`},
	{"Field", `@(T)`},
	{"Field", `@x T`},

	base.AssertfAt(typ.Kind() == k, pos, "want %v type, have %v", k, typ)
	return TypePtrAt(pos, typ)
}

// mapRType asserts that typ is a map type, and returns an expression
// that yields the *runtime._type value representing typ.
func mapRType(pos src.XPos, typ *types.Type) ir.Node {
	return kindRType(pos, typ, types.TMAP)
}

// chanRType asserts that typ is a map type, and returns an expression

	}
	if x.XListType != nil {
		ret.VendorExtensible.AddExtension("x-kubernetes-list-type", *x.XListType)
	}
	if x.XMapType != nil {
		ret.VendorExtensible.AddExtension("x-kubernetes-map-type", *x.XMapType)
	}
}

func (x *ValidationExtensions) toKubeOpenAPI(ret *spec.Schema) {
	if x == nil {
		return
	}

	if len(x.XValidations) > 0 {

		*out = make([]string, len(*in))
		copy(*out, *in)
	}
	if in.XListType != nil {
		in, out := &in.XListType, &out.XListType
		*out = new(string)
		**out = **in
	}
	if in.XMapType != nil {
		in, out := &in.XMapType, &out.XMapType
		*out = new(string)
		**out = **in
	}
	return
}

// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Extensions.

func (s *Structural) XListType() string {
	if s.Structural.XListType == nil {
		return ""
	}
	return *s.Structural.XListType
}

func (s *Structural) XMapType() string {
	if s.Structural.XMapType == nil {
		return ""
	}
	return *s.Structural.XMapType
}

func (s *Structural) XListMapKeys() []string {
	return s.Structural.XListMapKeys
}

func (s *Structural) AllOf() []common.Schema {

API rule violation: names_match,k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1,JSONSchemaProps,XListType
API rule violation: names_match,k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1,JSONSchemaProps,XMapType
API rule violation: names_match,k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1,JSONSchemaProps,XPreserveUnknownFields

		return nil, nil
	}

	ret := &Extensions{
		XEmbeddedResource: s.XEmbeddedResource,
		XIntOrString:      s.XIntOrString,
		XListMapKeys:      s.XListMapKeys,
		XListType:         s.XListType,
		XMapType:          s.XMapType,
	}

	if s.XPreserveUnknownFields != nil {
		if !*s.XPreserveUnknownFields {
			return nil, fmt.Errorf("internal error: 'x-kubernetes-preserve-unknown-fields' must be true or undefined")
		}

type KubeExtensions interface {
	IsXIntOrString() bool
	IsXEmbeddedResource() bool
	IsXPreserveUnknownFields() bool
	XListType() string
	XListMapKeys() []string
	XMapType() string
	XValidations() []ValidationRule
}

// ValidationRule represents a single x-kubernetes-validations rule.
type ValidationRule interface {
	Rule() string
	Message() string
	MessageExpression() string

}

func (s *Schema) IsXPreserveUnknownFields() bool {
	return isXPreserveUnknownFields(s.Schema)
}

func (s *Schema) XListType() string {
	return getXListType(s.Schema)
}

func (s *Schema) XMapType() string {
	return getXMapType(s.Schema)
}

func (s *Schema) XListMapKeys() []string {
	return getXListMapKeys(s.Schema)
}

func (s *Schema) XValidations() []common.ValidationRule {