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: unit_arg.rs
    path of file: ./repos/rust-clippy/tests/ui
    
    the code of the file until where you have to start completion: //@aux-build: proc_macros.rs
//@no-rustfix: overlapping suggestions
#![warn(clippy::unit_arg)]
#![allow(unused_must_use, unused_variables)]
#![allow(
    clippy::let_unit_value,
    clippy::needless_question_mark,
    clippy::never_loop,
    clippy::no_effect,
    clippy::or_fun_call,
    clippy::self_named_constructors,
    clippy::uninlined_format_args,
    clippy::unnecessary_wraps,
    clippy::unused_unit
)]

extern crate proc_macros;

use proc_macros::with_span;
use std::fmt::Debug;

fn foo<T: Debug>(t: T) {
    print
    
fn bad() {
    foo({
        1;
    });
    foo(foo(1));
    foo({
        foo(1);
        foo(2);
    });
    let b = Bar;
    b.bar({
        1;
    });
    taking_multiple_units(foo(0), foo(1));
    taking_multiple_units(foo(0), {
        foo(1);
        foo(2);
    });
    taking_multiple_units(
        {
            foo(0);
            foo(1);
        },
        {
            foo(2);
            foo(3);
        },
    );
    // here Some(foo(2)) isn't the top level statement expression, wrap the suggestion in a block
    None.or(Some(foo(2)));
    // in this case, the suggestion can be inlined, no need for a surrounding block
    // foo(()); foo(()) instead of { foo(()); foo(()) }
    foo(foo(()));
}