{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"trait_id:"}]}
        trait_id: to_chalk_trait_id(dispatch_from_dyn_did),
    let obligation = WhereClause::Implemented(TraitRef {
        substitution: Substitution::from_iter(Interner, [receiver_ty.clone(), unsized_receiver_ty]),