Function apply_predicates_cur 

pub fn apply_predicates_cur<I: DocIndexLike>(
    nodes: Vec<NodeId>,
    predicates: &[Expr],
    idx: &I,
    bindings: &dyn XPathBindings,
    compat: bool,
    current_node: Option<NodeId>,
) -> Result<Vec<NodeId>, XmlError>

apply_predicates threading the XSLT current() node into each predicate’s sub-context (see StaticContext::current_node).