borrowing + lifetime issues

Cargo.toml

[package]
name = "rust_learning"
version = "0.1.0"
authors = ["Stuart Nelson <stuartnelson3@gmail.com>"]

[dependencies]
prometheus = "0.2"

main.rs

extern crate prometheus;

use prometheus::{Opts, Registry, Counter, TextEncoder, Encoder};
use std::net::{TcpListener, TcpStream};
use std::io::Write;
use std::thread;

fn handle_client(stream: TcpStream) {
    // Turn this into a closure that accepts the prometheus::Registry
    // I'll make a different function or something that increments the prometheus::Counter.
}

fn main() {
    let listener = TcpListener::bind("0.0.0.0:5000").unwrap();

    // Create a Counter.
    let counter_opts = Opts::new("test_counter", "test counter help");
    let counter = Counter::with_opts(counter_opts).unwrap();

    // Create a Registry and register Counter.
    let r = Registry::new();
    r.register(Box::new(counter.clone())).unwrap();

    // accept connections and process them serially
    for stream in listener.incoming() {
        match stream {
            Ok(mut stream) => {
                thread::spawn(|| {
                    // handle_client(stream);
                    counter.inc();

                    let mut buffer = vec![];
                    let encoder = TextEncoder::new();
                    let metric_familys = r.gather();
                    encoder.encode(&metric_familys, &mut buffer).unwrap();
                    stream.write(&buffer);
                });
            }
            Err(e) => { /* connection failed */ }
        }
    }
}