Rust errors / Types and traits
Rust compiler error · checked with rustc 1.99.0
Rust error E0714: marker traits cannot have associated items
What it meansA #[marker] trait contained an associated item.
What rustc prints
error[E0714]: marker traits cannot have associated items
--> main.rs:6:5
|
6 | const N: usize; // error!
| ^^^^^^^^^^^^^^Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
E0714Types and traits
Activein rustc 1.99.0
8related errors linked below
The compiler team's explanation
A #[marker] trait contained an associated item.
Erroneous code example:
#![feature(marker_trait_attr)]
#![feature(associated_type_defaults)]
#[marker]
trait MarkerConst {
const N: usize; // error!
}
fn main() {}The items of marker traits cannot be overridden, so there's no need to have them when they cannot be changed per-type anyway. If you wanted them for ergonomic reasons, consider making an extension trait instead.
From rustc --explain E0714 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
Related errors
- E0308mismatched types
- E0277the trait bound is not satisfied
- E0599no method named X found in the current scope
- E0433failed to resolve
- E0690transparent struct needs at most one non-trivial field, but has 2
- E0692transparent struct cannot have other repr hints
- E0715impls for marker traits cannot contain items
- E0719the value of the associated type `Item` in trait `Iterator` is already specified
Up next
Often hit nextE0308: mismatched typesA related error from the same family.Read it next →Did this answer your question?