rust/tests/ui/discrim/discrim-overflow.rs

// Issue 23030: Detect overflowing discriminant

// See also run-pass/discrim-explicit-23030.rs where the suggested
// workaround is tested.

fn f_i8() {
    #[repr(i8)]
    enum A {
        Ok = i8::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
    }

    let x = A::Ok;
}

fn f_u8() {
    #[repr(u8)]
    enum A {
        Ok = u8::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
    }

    let x = A::Ok;
}

fn f_i16() {
    #[repr(i16)]
    enum A {
        Ok = i16::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
    }

    let x = A::Ok;
}

fn f_u16() {
    #[repr(u16)]
    enum A {
        Ok = u16::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
              //~| overflowed on value after 65535
    }

    let x = A::Ok;
}

fn f_i32() {
    #[repr(i32)]
    enum A {
        Ok = i32::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
              //~| overflowed on value after 2147483647
    }

    let x = A::Ok;
}

fn f_u32() {
    #[repr(u32)]
    enum A {
        Ok = u32::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
              //~| overflowed on value after 4294967295
    }

    let x = A::Ok;
}

fn f_i64() {
    #[repr(i64)]
    enum A {
        Ok = i64::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
              //~| overflowed on value after 9223372036854775807
    }

    let x = A::Ok;
}

fn f_u64() {
    #[repr(u64)]
    enum A {
        Ok = u64::MAX - 1,
        Ok2,
        OhNo, //~ ERROR enum discriminant overflowed [E0370]
              //~| overflowed on value after 18446744073709551615
    }

    let x = A::Ok;
}

fn main() { }