An opinionated builder macro in Rust
```rust
struct Request { #[required] url: String,
path: Option<String>,
messages: Vec<String>,
}
fn main() { let request = Request::new("example.com") .path("tester") .message("hello") .message("goodbye");
let expected = Request {
url: "example.com".to_string(),
path: Some("tester".to_string()),
messages: vec!["hello".to_string(), "goodbye".to_string()],
};
assert_eq!(request, expected);
}
```
Option<T> fieldsVec<T> fieldsCow<'a, T> fields&'a T) fieldsInto<T> conversionsHashMap<K, V> fieldsHashSet<T> fieldsBTreeMap<K, V> fieldsBTreeSet<T> fieldsBox<T> fieldsRc<T> fieldsArc<T> fields