Rust error E0477: #### Note: this error code is no longer emitted by the compiler

The compiler team's explanation

Note: this error code is no longer emitted by the compiler.

The type does not fulfill the required lifetime.

Erroneous code example:

use std::sync::Mutex;

struct MyString<'a> {
    data: &'a str,
}

fn i_want_static_closure<F>(a: F)
    where F: Fn() + 'static {}

fn print_string<'a>(s: Mutex<MyString<'a>>) {

    i_want_static_closure(move || {     // error: this closure has lifetime 'a
                                        //        rather than 'static
        println!("{}", s.lock().unwrap().data);
    });
}

In this example, the closure does not satisfy the 'static lifetime constraint. To fix this error, you need to double check the lifetime of the type. Here, we can fix this problem by giving s a static lifetime:

use std::sync::Mutex;

struct MyString<'a> {
    data: &'a str,
}

fn i_want_static_closure<F>(a: F)
    where F: Fn() + 'static {}

fn print_string(s: Mutex<MyString<'static>>) {

    i_want_static_closure(move || {     // ok!
        println!("{}", s.lock().unwrap().data);
    });
}

From rustc --explain E0477 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.