mongodb 1.1.1

The official MongoDB driver for Rust
Documentation 
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mod connection_string;
mod document;

use crate::{
    bson::{Bson, Document},
    error::Result,
    options::WriteConcern,
};

fn write_concern_to_document(write_concern: &WriteConcern) -> Result<Document> {
    match bson::to_bson(&write_concern)? {
        Bson::Document(doc) => Ok(doc),
        _ => unreachable!(),
    }
}