This is particularly handy when combined with `clap::value_t`.
Here's demo of it working with Clap:
```bash
cargo +stable init --bin tonic-demo
cd tonic-demo
cat <<-EOF >> Cargo.toml
clap = "*"
tonic = { path = "../hyperium/tonic/tonic" }
EOF
cat <<-EOF > src/main.rs
use clap::{value_t, App, Arg};
use tonic::transport::Endpoint;
fn main() {
let matches = App::new("tonic-demo")
.arg(Arg::with_name("host"))
.get_matches();
let x = value_t!(matches.value_of("host"), Endpoint);
println!("{:?}", x);
}
EOF
cargo +stable run -- https://127.0.0.1:443
```
Signed-off-by: Ana Hobden <[email protected]>
