// NOTE: Don't run this in the playground if the allocation is huge
// use the `...` button and view assembly only.

extern crate crossbeam; // 0.7.2
use crossbeam::atomic::AtomicCell;

fn main() {
    // call is required to avoid dead-code elimination
    // norun();
}

fn norun() {
    const MAX_VOCAB: usize = 2 << 28;
    let mut wordidx: Vec<AtomicCell<Option<u32>>> =
        Vec::with_capacity(MAX_VOCAB); wordidx.resize_with(MAX_VOCAB, || AtomicCell::new(None));

    // compiler trick to ensure the assembly is actually emitted:
    // because the address of the allocation is displayed, the optimizer
    // assumes that it actually has to write to the allocated memory.
    // See the llvm docs for `nocapture` attribute and Wikipedia
    // "Escape Analysis" for more.
    println!("{:p}", wordidx.as_ptr());
}