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: mod.rs
    path of file: ./repos/wrangler-legacy/src/settings/toml
    
    the code of the file until where you have to start completion: mod builder;
mod dev;
mod durable_objects;
mod environment;
mod kv_namespace;
mod manifest;
pub mod migrations;
mod r2_bucket;
mod route;
mod site;
pub(crate) mod target;
m
    
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "bundled" => Ok(UsageModel::Bundled),
            "unbound" => Ok(UsageModel::Unbound),
            _ => Err(anyhow!(
                "Invalid usage model; must be either \"bundled\" or \"unbound\""
            )),
        }
    }