{"ast_node_type":"function","tokens":[{"end":72,"kind":"keyword","start":0,"text":"fn"}]}
    fn check_item(&mut self, cx: &LateContext<'_>, it: &hir::Item<'_>) {
impl<'tcx> LateLintPass<'tcx> for VariantSizeDifferences {
        if let hir::ItemKind::Enum(_, _, ref enum_definition) = it.kind {