E0477 - Error codes index
Description: Book listing all Rust error codes

# Error code E0477

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

The type does not fulfill the required lifetime.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    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:

    #![allow(unused)]
    fn main() {
    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);
        });
    }
    }