{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
            // All valid indexing looks like this; might encounter non-valid indexes at this point.
        if let hir::ExprKind::Index(ref base, ref index, _) = e.kind {
            let base_ty = self.typeck_results.expr_ty_adjusted(base);