code: func (v *TextView) GetBuffer() (*TextBuffer, error) {
  	c := C.gtk_text_view_get_buffer(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapTextBuffer(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // GetBuffer is a wrapper around gtk_text_view_get_buffer().