once_cell_no_std 0.2.1

Sync single assignment cells for `no_std`
Documentation 
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fn main() {
    let cell = once_cell_no_std::OnceCell::<u32>::new();
    cell.get_or_init(|| {
        cell.get_or_init(|| 1).unwrap(); // this unwrap will panic because of `ConcurrentInitialization`
        2
    })
    .unwrap();
}