You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: struct_lits_visual.rs
    path of file: ./repos/rustfmt/tests/target
    
    the code of the file until where you have to start completion: // rustfmt-normalize_comments: true
// rustfmt-wrap_comments: true
// r
    
fn main() {
    let x = Bar;

    // Comment
    let y = Foo { a: x };

    Foo { a: foo(), // comment
          // comment
          b: bar(),
          ..something };

    Fooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo { a: f(), b: b() };

    Foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo { // Comment
                                                                                        a: foo(), /* Comment */
                                                                                        // Comment
                                                                                        b: bar() /* Comment */ };

    Foo { a: Bar, b: f() };

    Quux { x: if cond {
               bar();
           },
           y: baz() };

    Baz { x: yxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
          z: zzzzz /* test */ };

    A { // Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec a diam lectus. Sed sit
        // amet ipsum mauris. Maecenas congue ligula ac quam viverra nec consectetur ante
        // hendrerit. Donec et mollis dolor.
        first: item(),
        // Praesent et diam eget libero egestas mattis sit amet vitae augue.
        // Nam tincidunt congue enim, ut porta lorem lacinia consectetur.
        second: Item };

    Diagram { //                 o        This graph demonstrates how
              //                / \       significant whitespace is
              //               o   o      preserved.
              //              /|\   \
              //             o o o   o
              graph: G }
}