The name for an item declaration conflicts with an external crate’s name.
Erroneous code example:
extern crate core;
struct core;
fn main() {}
RunThere are two possible solutions:
Solution #1: Rename the item.
extern crate core;
struct xyz;
RunSolution #2: Import the crate with a different name.
extern crate core as xyz;
struct abc;
RunSee the Declaration Statements section of the reference for more information about what constitutes an item declaration and what does not.