//! Drives [`DiscoveryPaccClientStd`] end-to-end. The client opens
//! HTTPS and DNS streams lazily and reuses them across the
//! coroutine; the caller only configures the resolver (and
//! optionally the TLS profile via `with_tls`).
//!
//! ```sh
//! DOMAIN=fastmail.com DNS=1.1.1.1:53 \
//! cargo run --example pacc-client --features pacc,client
//! ```
use env;
use DiscoveryPaccClientStd;
use Url;