E0582 - Error codes index
Description: Book listing all Rust error codes

# Error code E0582

A lifetime is only present in an associated-type binding, and not in the input types to the trait.

Erroneous code example:

    fn bar<F>(t: F)
        // No type can satisfy this requirement, since `'a` does not
        // appear in any of the input types (here, `i32`):
        where F: for<'a> Fn(i32) -> Option<&'a i32>
    {
    }

    fn main() { }

To fix this issue, either use the lifetime in the inputs, or use `'static`. Example:

    fn bar<F, G>(t: F, u: G)
        where F: for<'a> Fn(&'a i32) -> Option<&'a i32>,
              G: Fn(i32) -> Option<&'static i32>,
    {
    }

    fn main() { }

Note: The examples above used to be (erroneously) accepted by the compiler, but this was since corrected. See issue #33685 for more details.