You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/doku/doku/src
    
    the code of the file until where you have to start completion: //! `fn(Code) -> Docs`
//!
//! # Overview
//!
//! Doku is a framework for documenting Rust data structures - it allows to
//! generate aesthetic, human-friendly descriptions of configuration types,
//! requests / responses, and so on.
//!
//! Say goodbye to s
    
//!     fn ty() -> doku::Type {
//!         let login = doku::Field {
//!             ty: doku::Type {
//!                 comment: Some("Who? Who?"),
//!                 example: Some(doku::Example::Simple("alan.turing")),
//!                 ..String::ty()
//!             },
//!             flattened: false,
//!             aliases: &[],
//!         };
//!
//!         doku::Type::from(doku::TypeKind::Struct {
//!             fields: doku::Fields::Named {
//!                 fields: vec![
//!                     ("login", login)
//!                 ],
//!             },
//!             transparent: false,
//!         })
//!     }