derive_builder 0.2.1

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

custom_derive!{
    #[derive(Debug, PartialEq, Default, Builder, Clone)]
    struct Lorem {
        ipsum: String,
        pub dolor: Option<String>,
        pub sit: i32,
        amet: bool,
    }
}

impl Lorem {
    pub fn new<T: Into<String>>(value: T) -> Self {
        Lorem {
            ipsum: value.into(),
            ..Default::default()
        }
    }
}

#[test]
fn contructor_sanity_check() {
    let x = Lorem::new("lorem");

    assert_eq!(x, Lorem { ipsum: "lorem".into(), dolor: None, sit: 0, amet: false, });
}

#[test]
fn setters() {
    let x = Lorem::new("lorem")
        .dolor(Some("dolor".into()))
        .sit(42)
        .amet(true)
        .clone();

    assert_eq!(x, Lorem { ipsum: "lorem".into(), dolor: Some("dolor".into()), sit: 42, amet: true, });
}