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() {}
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There are two possible solutions:
Solution #1: Rename the item.
Solution #2: Import the crate with a different name.
See the Declaration Statements section of the reference for more information about what constitutes an item declaration and what does not.