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E0003: Assignment Type Mismatch

You tried to assign a value of a different type to a variable.

Example​

fn main() {
    let mut x: i64 = 5;
    x = true;  // Error: cannot assign value of type `bool` to variable `x` of type `i64`
}

How to fix​

Assign a value of the correct type:

fn main() {
    let mut x: i64 = 5;
    x = 10;  // OK
}

Or change the variable's type if appropriate:

fn main() {
    let mut x: bool = false;
    x = true;  // OK
}