{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"if"}]}
        if let hir::Node::Item(hir::Item {
        let parent_id = tcx.hir_get_parent_item(self_ty.hir_id).def_id;
            kind: hir::ItemKind::Impl(hir::Impl { self_ty: impl_self_ty, of_trait, generics, .. }),