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E0008: General Type Mismatch

The type of an expression doesn't match the expected type.

Example​

fn main() {
    let x: bool = 42;  // Error: expected type `bool`, found `i64`
}

How to fix​

Ensure the expression has the correct type:

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

Or adjust the type annotation:

fn main() {
    let x: i64 = 42;  // OK
}