"CompilableFn", {"n_a:float", "n_b:float"}, {"n_c:float"}, {},
      {{{"n_c"}, "Add", {"n_a", "n_b"}, {{"T", DT_FLOAT}}}});
  FunctionDef uncompilable =
      FunctionDefHelper::Define("UncompilableFn", {"n_a:float"}, {"n_c:float"},
                                {}, {{{"n_c"}, "UncompilableUnary", {"n_a"}}});

  FunctionDefLibrary flib;
  *flib.add_function() = compilable;
  *flib.add_function() = uncompilable;