{"ast_node_type":"function","tokens":[{"end":56,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Self {
impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for &'tcx [(ty::Clause<'tcx>, Span)] {
        ty::codec::RefDecodable::decode(d)