{"ast_node_type":"impl","tokens":[{"end":100,"kind":"keyword","start":0,"text":".expect(\"assoc"}]}
        .expect("assoc ty value should not exist"); // validated when building the impl data as well
        .associated_type_by_name(&type_alias_data.name)
    let (ty, binders) = db.ty(type_alias.into()).into_value_and_skipped_binders();