{"ast_node_type":"function","tokens":[{"end":68,"kind":"keyword","start":0,"text":"fn"}]}
                fn span_of_infer(ty: &hir::Ty<'_>) -> Option<Span> {
            if let &hir::ClosureBinder::For { span: for_sp, .. } = binder {
                    /// Look for `_` anywhere in the signature of a `for<> ||` closure.