## Keyboard shortcuts

Press `←` or `→` to navigate between chapters

Press `S` or `/` to search in the book

Press `?` to show this help

Press `Esc` to hide this help

# Error code E0559

An unknown field was specified into an enum's structure variant.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    enum Field {
        Fool { x: u32 },
    }

    let s = Field::Fool { joke: 0 };
    // error: struct variant `Field::Fool` has no field named `joke`
    }

Verify you didn't misspell the field's name or that the field exists. Example:

    #![allow(unused)]
    fn main() {
    enum Field {
        Fool { joke: u32 },
    }

    let s = Field::Fool { joke: 0 }; // ok!
    }