{"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
        let ty = self.cx.typeck_results().node_type(pat_hir_id);
    fn total_fields_in_tuple(&self, pat_hir_id: HirId, span: Span) -> Result<usize, Cx::Error> {
        match self.cx.structurally_resolve_type(span, ty).kind() {