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E0002: Variable Redeclaration

You tried to declare a variable that already exists in the current scope.

Example​

fn main() {
    let x = 5;
    let x = 10;  // Error: variable `x` is already defined in this scope
}

How to fix​

Use a different name for the new variable:

fn main() {
    let x = 5;
    let y = 10;  // OK
}

Or, if you want to reassign the variable, declare it as mutable:

fn main() {
    let mut x = 5;
    x = 10;  // OK
}