E0024: Enum Payload Mismatch

The payload you provided for an enum variant doesn't match its definition.

Example

enum Message {
    Quit,
    Move { x: i64, y: i64 },
    Write(i64),
}

fn main() {
    let m = Message::Quit(42);  // Error: variant `Message::Quit` expects no payload but a tuple with 1 value provided
}

enum Message {
    Quit,
    Move { x: i64, y: i64 },
    Write(i64),
}

fn main() {
    let m = Message::Write;  // Error: variant `Message::Write` expects a tuple with 1 value but no payload provided
}

How to fix

Match the variant's expected payload:

enum Message {
    Quit,
    Move { x: i64, y: i64 },
    Write(i64),
}

fn main() {
    let a = Message::Quit;              // OK: unit variant
    let b = Message::Move { x: 1, y: 2 };  // OK: struct variant
    let c = Message::Write(42);          // OK: tuple variant
}