{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"query"}]}
    query fn_sig(key: DefId) -> ty::EarlyBinder<'tcx, ty::PolyFnSig<'tcx>> {
    /// Computes the signature of the function.
        desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }