{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let Ok(src) = self.tcx.sess.source_map().span_to_snippet(span) else {
        let span = if let hir::ExprKind::Lit(lit) = &expr.kind { lit.span } else { expr.span };
            return false;