auto-builder 0.2.0

A derive macro to implement the builder pattern for any struct
Documentation 
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use auto_builder::Builder;

#[test]
fn returns_err_if_not_all_fields_set() {
    #[derive(Builder)]
    struct Foo {
        _a: i32,
        _b: Option<i32>,
    }

    let _foo = FooBuilder::new()._a(1).build();
    assert!(_foo.is_err());
}

#[test]
fn returns_ok_if_all_fields_set() {
    #[derive(Builder)]
    struct Foo {
        _a: i32,
        _b: Option<i32>,
    }

    let _foo = FooBuilder::new()._a(1)._b(Some(2)).build();
    assert!(_foo.is_ok());

    let instance = _foo.unwrap();
    assert!(instance._a == 1);
    assert!(instance._b == Some(2));
}