Error code E0260

The name for an item declaration conflicts with an external crate's name.

Erroneous code example:

extern crate core;

struct core;

fn main() {}

There are two possible solutions:

Solution #1: Rename the item.

#![allow(unused)]
fn main() {
extern crate core;

struct xyz;
}

Solution #2: Import the crate with a different name.

#![allow(unused)]
fn main() {
extern crate core as xyz;

struct abc;
}

See the Declaration Statements section of the reference for more information about what constitutes an item declaration and what does not.