Rustfmt changes meaning of closure, also not idempotent

Input program, which compiles:
https://play.rust-lang.org/?edition=2018&gist=046bcee6f5a6524efd1cf0d71b383fef

fn main() {
    || {
        println!();
        || 0
    }().to_string();
}

As of rustfmt 2.0.0-rc.1-nightly (b9138e06 2020-02-10), rustfmt incorrectly changes this to the following which does not compile:

fn main() {
    || {
        {
            println!();
            || 0
        }()
        .to_string()
    };
}

It is also not idempotent, since running rustfmt again changes it to:

fn main() {
    || {
        {
            println!();
            || 0
        }
        ().to_string()
    };
}

Start with the Rust playground reproducer linked in the issue and run rustfmt on the provided closure, then run it again on the output. Trace the formatter behavior that changes the closure's meaning and verify that the formatted program still compiles and remains unchanged on a second run.