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//! A procedural macro which creates a "staged" builder for a type.
//!
//! Staged (also known as telescopic) builders are a style of infallible builders; code will not compile if any required
//! fields are not set. Specifically, the builder advances in order through a sequence of "stage" types, each
//! corresponding to a required field of the struct. The final stage has setters for all optional fields and the final
//! `.build()` method.
//!
//! See the documentation for [`#[staged_builder]`](staged_builder) for more details.
//!
//! # Examples
//!
//! ```
//! use staged_builder::staged_builder;
//!
//! #[staged_builder]
//! struct Person {
//! #[builder(into)]
//! name: String,
//! age: u32,
//! #[builder(list(item(type = Person)))]
//! parents: Vec<Person>,
//! }
//!
//! # fn main() {
//! let person = Person::builder()
//! .name("John Doe")
//! .age(25)
//! .build();
//! # }
//! ```
// Not part of the public API.
pub use __StagedBuilderInternalDerive;
pub use staged_builder;
// Not part of the public API.
/// A trait for types which validate their state before construction finishes.
///
/// The generated builder will call this method if the `#[builder(validate)]` attribute is placed at the struct level.
/// An example type using [`#[staged_builder]`](staged_builder).