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/neon/s3_scrubber/src
    
    the code of the file until where you have to start completion: #![deny(unsafe_code)]
#![deny(clippy::undocumented_unsafe_blocks)]
pub mod checks;
pub mod cloud_admin_api;
pu
    
    pub fn from_env() -> anyhow::Result<Self> {
        let sso_account_id = env::var("SSO_ACCOUNT_ID").ok();
        let region = env::var("REGION").context("'REGION' param retrieval")?;
        let bucket = env::var("BUCKET").context("'BUCKET' param retrieval")?;
        let prefix_in_bucket = env::var("BUCKET_PREFIX").ok();

        Ok(Self {
            region,
            bucket,
            prefix_in_bucket,
            sso_account_id,
        })
    }