derive_builder 0.4.2

Rust macro to automatically implement the builder pattern for arbitrary structs.
Documentation 
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#[macro_use]
extern crate pretty_assertions;
#[macro_use]
extern crate derive_builder;

pub mod foo {
    #[derive(Debug, PartialEq, Default, Builder, Clone)]
    #[builder(private, setter(into))]
    pub struct Lorem {
        pub private: String,
        #[builder(public)]
        pub public: String,
    }

    #[derive(Debug, PartialEq, Default, Builder, Clone)]
    #[builder(public, setter(into))]
    pub struct Ipsum {
        #[builder(private)]
        pub private: String,
        pub public: String,
    }

    #[test]
    fn setters_same_module() {
        let x = LoremBuilder::default()
            .public("Hello")
            .private("world!")
            .build()
            .unwrap();

        assert_eq!(x,
                   Lorem {
                       public: "Hello".into(),
                       private: "world!".into(),
                   });

        let y = IpsumBuilder::default()
            .public("Hello")
            .private("world!")
            .build()
            .unwrap();

        assert_eq!(y,
                   Ipsum {
                       public: "Hello".into(),
                       private: "world!".into(),
                   });
    }
}

#[test]
#[should_panic(expected="`private` must be initialized")]
fn public_setters_override_foreign_module() {
    let x = foo::LoremBuilder::default().public("Hello").build().unwrap();

    assert_eq!(x.public, String::from("Hello"));
}

#[test]
#[should_panic(expected="`private` must be initialized")]
fn public_setters_foreign_module() {
    let y = foo::IpsumBuilder::default().public("Hello").build().unwrap();

    assert_eq!(y.public, String::from("Hello"));
}

// compile-test should fail with "error: method `ipsum` is private"
// fn setters_foreign_module() {
//     let x = foo::Lorem::default()
//         .ipsum("Hello world!")
//         .clone();
//
//     assert_eq!(x, foo::Lorem { ipsum: "Hello world!".into() });
// }