// Test nil comparison cases

// nil == nil is always true
fn nilEqNil() -> bool {
    return nil == nil;
}

// nil <> nil is always false
fn nilNeNil() -> bool {
    return nil <> nil;
}

// nil == opt (reversed order, pointer optional)
unsafe fn nilEqOptPtr(a: ?*i32) -> bool {
    return nil == a;
}

// nil <> opt (reversed order, pointer optional)
unsafe fn nilNeOptPtr(a: ?*i32) -> bool {
    return nil <> a;
}

// nil == opt (reversed order, aggregate optional)
fn nilEqOptAgg(a: ?i32) -> bool {
    return nil == a;
}

// nil <> opt (reversed order, aggregate optional)
fn nilNeOptAgg(a: ?i32) -> bool {
    return nil <> a;
}