#![allow(unused_variables)]
#![feature(allocator_api)]
fn main() {
    fn _inner() -> core::result::Result<(), impl core::fmt::Debug> {
        use std::rc::Rc;
        let zero = Rc::<u32>::try_new_zeroed()?;
        let zero = unsafe { zero.assume_init() };
        assert_eq!(* zero, 0);
        Ok::<(), std::alloc::AllocError>(())
    }
    _inner().unwrap()
}