E0574 - Error codes index (original) (raw)
Error codes index
Error code E0574
Something other than a struct, variant or union has been used when one was expected.
Erroneous code example:
#![allow(unused)]
fn main() {
mod mordor {}
let sauron = mordor { x: () }; // error!
enum Jak {
Daxter { i: isize },
}
let eco = Jak::Daxter { i: 1 };
match eco {
Jak { i } => {} // error!
}
}
In all these errors, a type was expected. For example, in the first error, we tried to instantiate the mordor
module, which is impossible. If you want to instantiate a type inside a module, you can do it as follow:
#![allow(unused)]
fn main() {
mod mordor {
pub struct TheRing {
pub x: usize,
}
}
let sauron = mordor::TheRing { x: 1 }; // ok!
}
In the second error, we tried to bind the Jak
enum directly, which is not possible: you can only bind one of its variants. To do so:
#![allow(unused)]
fn main() {
enum Jak {
Daxter { i: isize },
}
let eco = Jak::Daxter { i: 1 };
match eco {
Jak::Daxter { i } => {} // ok!
}
}