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! } }