//! Actix Web example with correlation-enriched root spans.
//!
//! Run with `cargo run --example actix --features with-actix-web` then
//! `curl -H "X-Request-ID: req-abc123" http://127.0.0.1:8080/`. Logs will
//! include `correlation_id=req-abc123` on the root span.
use ;
use ;
async
async