code: func (v *TextBuffer) CreateChildAnchor(iter *TextIter) *TextChildAnchor {
  	ret := C.gtk_text_buffer_create_child_anchor(v.native(), iter.native())
  	return (*TextChildAnchor)(ret)
  }
docs: // CreateChildAnchor() is a wrapper around gtk_text_buffer_create_child_anchor().
  // Since it copies garbage from the stack into the padding bytes of iter,
  // iter can't be reliably reused after this call unless GODEBUG=cgocheck=0.