{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"///"}]}
    /// Return `(impl_id, self_ty)`.
    /// Given a crate and a trait, look up all impls of that trait in the crate.
    query implementations_of_trait(_: (CrateNum, DefId)) -> &'tcx [(DefId, Option<SimplifiedType>)] {