derive_builder 0.20.2

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

#[derive(Debug, PartialEq, Default, Builder, Clone)]
struct Lorem<'a> {
    ipsum: &'a str,
}

#[test]
fn error_if_uninitialized() {
    let error = LoremBuilder::default().build().unwrap_err();
    assert_eq!(&error.to_string(), "`ipsum` must be initialized");
}

#[test]
fn builder_test() {
    let x = LoremBuilder::default().ipsum("ipsum").build().unwrap();

    assert_eq!(x, Lorem { ipsum: "ipsum" });
}