{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"assoc_type_id:"}]}
        assoc_type_id: chalk_ir::AssocTypeId<Interner>,
        impl_id: chalk_ir::ImplId<Interner>,
    ) -> Option<rust_ir::AssociatedTyValueId<Interner>> {