pub unsafe extern "C" fn gtk_cclosure_expression_new(
    value_type: GType,
    marshal: GClosureMarshal,
    n_params: c_uint,
    params: *mut *mut GtkExpression,
    callback_func: GCallback,
    user_data: gpointer,
    user_destroy: GClosureNotify
) -> *mut GtkCClosureExpression