{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
            let parent_len = generics.parent_generics().map_or(0, |g| g.len_self());
            let generics = generics(db, from_assoc_type_id(projection_ty.associated_ty_id).into());
            let (trait_args, assoc_args) =