{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"if"}]}
            if let (Some(expr), hir::Node::Item(hir::Item { kind: hir::ItemKind::Fn { .. }, .. })) =
            let parent = self.tcx.parent_hir_node(self.tcx.parent_hir_id(block.hir_id));
                (&block.expr, parent)