rayon-core 1.4.1

Core APIs for Rayon
Documentation 
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use std::mem;

pub fn leak<T>(v: T) -> &'static T {
    unsafe {
        let b = Box::new(v);
        let p: *const T = &*b;
        mem::forget(b); // leak our reference, so that `b` is never freed
        &*p
    }
}