{"ast_node_type":"function","tokens":[{"end":51,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_item(&mut self, item: &'a ast::Item) {
impl<'a, 'ra, 'tcx> Visitor<'a> for UnusedImportCheckVisitor<'a, 'ra, 'tcx> {
        self.item_span = item.span_with_attributes();