Rust macro expansion

#![feature(prelude_import)]
#[prelude_import]
use std::prelude::rust_2021::*;
#[macro_use]
extern crate std;
fn main() {
    {
        ::std::io::_print(
            ::core::fmt::Arguments::new_v1(
                &["", "\n", "\n", "\n"],
                &match (
                    &"HelloWorld",
                    &(2.to_string() + "up?"),
                    &{
                        let res = ::alloc::fmt::format(
                            ::core::fmt::Arguments::new_v1(
                                &["", ""],
                                &[
                                    ::core::fmt::ArgumentV1::new_display(&"I'm"),
                                    ::core::fmt::ArgumentV1::new_display(&"0x90"),
                                ],
                            ),
                        );
                        res
                    },
                ) {
                    args => {
                        [
                            ::core::fmt::ArgumentV1::new_display(args.0),
                            ::core::fmt::ArgumentV1::new_display(args.1),
                            ::core::fmt::ArgumentV1::new_display(args.2),
                        ]
                    }
                },
            ),
        );
    };
}