{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"query"}]}
    query impl_trait_header(impl_id: DefId) -> Option<ty::ImplTraitHeader<'tcx>> {
    /// Return `None` if this is an inherent impl.
        desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }