Trait CustomFunction 
Source pub trait CustomFunction {
    // Provided methods
    fn fetch_function<'a, 'life0, 'async_trait>(
        &'a self,
        _func_name: &'life0 str,
    ) -> Pin<Box<dyn Future<Output = Result<Option<&'a StructCustomFunction>>> + Send + 'async_trait>>
       where Self: Sync + 'async_trait,
             'a: 'async_trait,
             'life0: 'async_trait { ... }
    fn fetch_all_functions<'a, 'async_trait>(
        &'a self,
    ) -> Pin<Box<dyn Future<Output = Result<Vec<&'a StructCustomFunction>>> + Send + 'async_trait>>
       where Self: Sync + 'async_trait,
             'a: 'async_trait { ... }
}