Error code E0769

A tuple struct or tuple variant was used in a pattern as if it were a struct or struct variant.

Erroneous code example:

#![allow(unused)]
fn main() {
enum E {
    A(i32),
}

let e = E::A(42);

match e {
    E::A { number } => { // error!
        println!("{}", number);
    }
}
}

To fix this error, you can use the tuple pattern:

#![allow(unused)]
fn main() {
enum E {
    A(i32),
}
let e = E::A(42);
match e {
    E::A(number) => { // ok!
        println!("{}", number);
    }
}
}

Alternatively, you can also use the struct pattern by using the correct field names and binding them to new identifiers:

#![allow(unused)]
fn main() {
enum E {
    A(i32),
}
let e = E::A(42);
match e {
    E::A { 0: number } => { // ok!
        println!("{}", number);
    }
}
}