{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
impl<'tcx> LayoutOfHelpers<'tcx> for UnwrapLayoutCx<'tcx> {
    fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {