code: func (v *TextBuffer) GetIterAtLine(line int) *TextIter {
  	var iter C.GtkTextIter
  	C.gtk_text_buffer_get_iter_at_line(v.native(), &iter, C.gint(line))
  	return (*TextIter)(&iter)
  }
docs: // GetIterAtLine() is a wrapper around gtk_text_buffer_get_iter_at_line().