Default for composite struct

---

examples/struct/default-for-composite-struct/src/main.rs

#![allow(clippy::derivable_impls)]

#[derive(Debug)]
#[allow(dead_code)]
struct Something {
    name: String,
    input: Input,
}

#[derive(Debug)]
#[allow(dead_code)]
struct Input {
    name: String,
}

impl Something {
    pub fn new() -> Something {
        Something {
            name: String::new(),
            input: Input::new(),
        }
    }
}

impl Input {
    pub fn new() -> Input {
        Input {
            name: String::new(),
        }
    }
}

impl Default for Something {
    fn default() -> Something {
        Something {
            name: String::new(),
            input: Input { ..Input::default() },
        }
    }
}

impl Default for Input {
    fn default() -> Input {
        Input {
            name: String::new(),
        }
    }
}

fn main() {
    let sg = Something {
        name: String::from("Foo Bar"),
        input: Input {
            name: String::from("input text"),
        },
    };
    println!("{:?}", sg);

    let new = Something::new();
    println!("{:?}", new);

    let empty = Something {
        ..Something::default()
    };
    println!("{:?}", empty);

    let with_name = Something {
        name: String::from("Hello"),
        ..Something::default()
    };
    println!("{:?}", with_name);
}

[src/main.rs:58:5] sg = Something {
    name: "Foo Bar",
    input: Input {
        name: "input text",
    },
}
[src/main.rs:61:5] new = Something {
    name: "",
    input: Input {
        name: "",
    },
}
[src/main.rs:66:5] empty = Something {
    name: "",
    input: Input {
        name: "",
    },
}
[src/main.rs:73:5] with_name = Something {
    name: "Hello",
    input: Input {
        name: "",
    },
}