{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"type"}]}
    type Target = ObligationCtxt<'a, 'tcx, FulfillmentError<'tcx>>;
impl<'a, 'tcx> Deref for WfCheckingCtxt<'a, 'tcx> {
    fn deref(&self) -> &Self::Target {