{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
        let did = fi.owner_id.to_def_id();
    fn insert(&mut self, tcx: TyCtxt<'_>, fi: hir::ForeignItemId) -> Option<hir::OwnerId> {
        let instance = Instance::new_raw(did, ty::List::identity_for_item(tcx, did));