diff --git a/internal/generate/field.go b/internal/generate/field.go
index 7f7c3a49..59456242 100644
--- a/internal/generate/field.go
+++ b/internal/generate/field.go
@@ -61,3 +61,7 @@ func (f Field) generate(g *jen.Group) {
 
 	f.Type.generator.generateDeclaration(g, f.goVarName)
 }
+
+func (f *Field) mergeAddenda(addenda *Field) {
+	f.Private = addenda.Private
+}
diff --git a/internal/generate/fields.go b/internal/generate/fields.go
index 2f56fab9..340c0bd2 100644
--- a/internal/generate/fields.go
+++ b/internal/generate/fields.go
@@ -15,3 +15,21 @@ func (ff Fields) generate(g *jen.Group) {
 		f.generate(g)
 	}
 }
+
+func (ff Fields) forName(name string) *Field {
+	for _, field := range ff {
+		if field.Name == name {
+			return field
+		}
+	}
+
+	return nil
+}
+
+func (ff Fields) mergeAddenda(addenda Fields) {
+	for _, addendaField := range addenda {
+		if field := ff.forName(addendaField.Name); field != nil {
+			field.mergeAddenda(addendaField)
+		}
+	}
+}
diff --git a/internal/generate/record.go b/internal/generate/record.go
index 87276c37..4270eb7c 100644
--- a/internal/generate/record.go
+++ b/internal/generate/record.go
@@ -69,6 +69,7 @@ func (r *Record) mergeAddenda(addenda *Record) {
 	r.Constructors.mergeAddenda(addenda.Constructors)
 	r.Functions.mergeAddenda(addenda.Functions)
 	r.Methods.mergeAddenda(addenda.Methods)
+	r.Fields.mergeAddenda(addenda.Fields)
 }
 
 func (r *Record) generate(g *jen.Group, version *Version) {
diff --git a/internal/gir-files/Gtk-3.0-addenda.gir b/internal/gir-files/Gtk-3.0-addenda.gir
index 9b511c9d..94ecd363 100644
--- a/internal/gir-files/Gtk-3.0-addenda.gir
+++ b/internal/gir-files/Gtk-3.0-addenda.gir
@@ -188,6 +188,14 @@
     <record name="TreePath">
       <method blacklist="true" c:identifier="gtk_tree_path_get_indices"/>
     </record>
+
+
+    <record name="TreeIter">
+        <field name="stamp" private="1"/>
+        <field name="user_data" private="1"/>
+        <field name="user_data2" private="1"/>
+        <field name="user_data3" private="1"/>
+    </record>
   </namespace>
 </repository>
 
diff --git a/lib/gtk/v-.go b/lib/gtk/v-.go
index e1cb05b6..e4f05648 100644
--- a/lib/gtk/v-.go
+++ b/lib/gtk/v-.go
@@ -67977,11 +67977,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -67990,26 +67990,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.10.go b/lib/gtk/v-2.10.go
index 61edcd0d..513893d9 100644
--- a/lib/gtk/v-2.10.go
+++ b/lib/gtk/v-2.10.go
@@ -82112,11 +82112,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -82125,26 +82125,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.12.go b/lib/gtk/v-2.12.go
index 366ebaa2..5fbfac83 100644
--- a/lib/gtk/v-2.12.go
+++ b/lib/gtk/v-2.12.go
@@ -84676,11 +84676,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -84689,26 +84689,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.14.go b/lib/gtk/v-2.14.go
index 9d3a5d6f..327ac5d3 100644
--- a/lib/gtk/v-2.14.go
+++ b/lib/gtk/v-2.14.go
@@ -86366,11 +86366,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -86379,26 +86379,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.16.go b/lib/gtk/v-2.16.go
index a51763ff..d0eac741 100644
--- a/lib/gtk/v-2.16.go
+++ b/lib/gtk/v-2.16.go
@@ -87598,11 +87598,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -87611,26 +87611,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.18.go b/lib/gtk/v-2.18.go
index 956e8ed6..acbf5b03 100644
--- a/lib/gtk/v-2.18.go
+++ b/lib/gtk/v-2.18.go
@@ -88847,11 +88847,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -88860,26 +88860,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.2.go b/lib/gtk/v-2.2.go
index fa97861d..c5b4c1ce 100644
--- a/lib/gtk/v-2.2.go
+++ b/lib/gtk/v-2.2.go
@@ -69013,11 +69013,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -69026,26 +69026,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.20.go b/lib/gtk/v-2.20.go
index af3de8a8..8699f9f5 100644
--- a/lib/gtk/v-2.20.go
+++ b/lib/gtk/v-2.20.go
@@ -89816,11 +89816,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -89829,26 +89829,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.22.go b/lib/gtk/v-2.22.go
index 41c12022..2197e601 100644
--- a/lib/gtk/v-2.22.go
+++ b/lib/gtk/v-2.22.go
@@ -90041,11 +90041,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -90054,26 +90054,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.24.go b/lib/gtk/v-2.24.go
index 139e1e84..965d965b 100644
--- a/lib/gtk/v-2.24.go
+++ b/lib/gtk/v-2.24.go
@@ -90285,11 +90285,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -90298,26 +90298,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.4.go b/lib/gtk/v-2.4.go
index 8d25d73a..7b3cc65c 100644
--- a/lib/gtk/v-2.4.go
+++ b/lib/gtk/v-2.4.go
@@ -74153,11 +74153,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -74166,26 +74166,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.6.go b/lib/gtk/v-2.6.go
index ec585871..bc112fd0 100644
--- a/lib/gtk/v-2.6.go
+++ b/lib/gtk/v-2.6.go
@@ -76133,11 +76133,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -76146,26 +76146,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-2.8.go b/lib/gtk/v-2.8.go
index 85d574bd..f8fe4309 100644
--- a/lib/gtk/v-2.8.go
+++ b/lib/gtk/v-2.8.go
@@ -76731,11 +76731,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -76744,26 +76744,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.0.go b/lib/gtk/v-3.0.go
index 377f3a96..17187938 100644
--- a/lib/gtk/v-3.0.go
+++ b/lib/gtk/v-3.0.go
@@ -95201,11 +95201,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -95214,26 +95214,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.10.go b/lib/gtk/v-3.10.go
index 1445694b..15e75e7d 100644
--- a/lib/gtk/v-3.10.go
+++ b/lib/gtk/v-3.10.go
@@ -99501,11 +99501,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -99514,26 +99514,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.12.go b/lib/gtk/v-3.12.go
index 0e39b91e..b258e7fd 100644
--- a/lib/gtk/v-3.12.go
+++ b/lib/gtk/v-3.12.go
@@ -100238,11 +100238,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -100251,26 +100251,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.14.go b/lib/gtk/v-3.14.go
index 09292169..40137a9f 100644
--- a/lib/gtk/v-3.14.go
+++ b/lib/gtk/v-3.14.go
@@ -102677,11 +102677,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -102690,26 +102690,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.16.go b/lib/gtk/v-3.16.go
index 2eb39618..09800c38 100644
--- a/lib/gtk/v-3.16.go
+++ b/lib/gtk/v-3.16.go
@@ -103942,11 +103942,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -103955,26 +103955,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.18.go b/lib/gtk/v-3.18.go
index 7f37da7b..2d15c99c 100644
--- a/lib/gtk/v-3.18.go
+++ b/lib/gtk/v-3.18.go
@@ -104349,11 +104349,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -104362,26 +104362,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.2.go b/lib/gtk/v-3.2.go
index 70bae8d7..5374312f 100644
--- a/lib/gtk/v-3.2.go
+++ b/lib/gtk/v-3.2.go
@@ -95997,11 +95997,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -96010,26 +96010,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.20.go b/lib/gtk/v-3.20.go
index 27793f5e..a4107798 100644
--- a/lib/gtk/v-3.20.go
+++ b/lib/gtk/v-3.20.go
@@ -106029,11 +106029,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -106042,26 +106042,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.22.26.go b/lib/gtk/v-3.22.26.go
index 1c94c7d6..f972bf26 100644
--- a/lib/gtk/v-3.22.26.go
+++ b/lib/gtk/v-3.22.26.go
@@ -106550,11 +106550,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -106563,26 +106563,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.22.29.go b/lib/gtk/v-3.22.29.go
index 07d792b9..4f7a8b70 100644
--- a/lib/gtk/v-3.22.29.go
+++ b/lib/gtk/v-3.22.29.go
@@ -106706,11 +106706,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -106719,26 +106719,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.22.6.go b/lib/gtk/v-3.22.6.go
index b83d8d13..c93c64fc 100644
--- a/lib/gtk/v-3.22.6.go
+++ b/lib/gtk/v-3.22.6.go
@@ -106461,11 +106461,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -106474,26 +106474,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.22.go b/lib/gtk/v-3.22.go
index e10d920c..55af628a 100644
--- a/lib/gtk/v-3.22.go
+++ b/lib/gtk/v-3.22.go
@@ -106444,11 +106444,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -106457,26 +106457,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.4.go b/lib/gtk/v-3.4.go
index 79f67a88..4c880f13 100644
--- a/lib/gtk/v-3.4.go
+++ b/lib/gtk/v-3.4.go
@@ -96722,11 +96722,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -96735,26 +96735,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.6.go b/lib/gtk/v-3.6.go
index 9db39e0a..4aa2eeed 100644
--- a/lib/gtk/v-3.6.go
+++ b/lib/gtk/v-3.6.go
@@ -97299,11 +97299,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -97312,26 +97312,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }
diff --git a/lib/gtk/v-3.8.go b/lib/gtk/v-3.8.go
index 06f18af7..b1f482e9 100644
--- a/lib/gtk/v-3.8.go
+++ b/lib/gtk/v-3.8.go
@@ -97540,11 +97540,11 @@ func (recv *TreeDragSourceIface) Equals(other *TreeDragSourceIface) bool {
 
 // TreeIter is a wrapper around the C record GtkTreeIter.
 type TreeIter struct {
-	native    *C.GtkTreeIter
-	Stamp     int32
-	UserData  uintptr
-	UserData2 uintptr
-	UserData3 uintptr
+	native *C.GtkTreeIter
+	// Private : stamp
+	// Private : user_data
+	// Private : user_data2
+	// Private : user_data3
 }
 
 func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
@@ -97553,26 +97553,12 @@ func TreeIterNewFromC(u unsafe.Pointer) *TreeIter {
 		return nil
 	}
 
-	g := &TreeIter{
-		Stamp:     (int32)(c.stamp),
-		UserData:  (uintptr)(c.user_data),
-		UserData2: (uintptr)(c.user_data2),
-		UserData3: (uintptr)(c.user_data3),
-		native:    c,
-	}
+	g := &TreeIter{native: c}
 
 	return g
 }
 
 func (recv *TreeIter) ToC() unsafe.Pointer {
-	recv.native.stamp =
-		(C.gint)(recv.Stamp)
-	recv.native.user_data =
-		(C.gpointer)(recv.UserData)
-	recv.native.user_data2 =
-		(C.gpointer)(recv.UserData2)
-	recv.native.user_data3 =
-		(C.gpointer)(recv.UserData3)
 
 	return (unsafe.Pointer)(recv.native)
 }