{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"desc"}]}
        desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
    query fn_sig(key: DefId) -> ty::EarlyBinder<'tcx, ty::PolyFnSig<'tcx>> {
        cache_on_disk_if { key.is_local() }