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# Error code E0381

It is not allowed to use or capture an uninitialized variable.

Erroneous code example:

    fn main() {
        let x: i32;
        let y = x; // error, use of possibly-uninitialized variable
    }

To fix this, ensure that any declared variables are initialized before being used. Example:

    fn main() {
        let x: i32 = 0;
        let y = x; // ok!
    }