pub type ExsltClosure = &'static (dyn Fn(&mut XPathContext, &[XPathValue]) -> Result<XPathValue, String> + Send + Sync);Expand description
A capture-capable EXSLT function (used by func:function bodies).
Stored as a leaked &'static reference so entries are Copy and the
registry can hand out clones. The process-wide registry lives for the
lifetime of the program, so leaking is intentional and bounded.