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: structs.rs
    path of file: ./repos/c2rust/c2rust-transpile/src/translator
    
    the code of the file until where you have to start completion: #![deny(missing_docs)]
//! This module provides translation for bitfield structs and operations on them. Generated code
//! requires the use of the c2rust-bitfields crate.

use std::collections::HashSet;
use std::ops::Index;

use super::named_references::NamedReference;
use super::TranslationError;
use crate::c_ast::{BinOp, CDeclId, CDeclKind, CExprId, CRecordId, CTypeId};
use crate::diagnostics::TranslationResult;
use crate::trans
    
fn contains_block(expr_kind: &Expr) -> bool {
    use Expr::*;
    match expr_kind {
        Block(..) => true,
        Assign(ExprAssign { left, right, .. })
        | AssignOp(ExprAssignOp { left, right, .. })
        | Binary(ExprBinary { left, right, .. }) => {
            [left, right].iter().any(|expr| contains_block(expr))
        }
        Unary(ExprUnary { expr, .. }) | Cast(ExprCast { expr, .. }) => contains_block(expr),
        MethodCall(ExprMethodCall { args, .. }) => args.iter().any(contains_block),
        _ => false,
    }
}