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Rollup merge of #85817 - r00ster91:patch-9, r=dtolnay

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Fix a typo

See also: #85737
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Guillaume Gomez 2021-05-30 21:06:52 +02:00 • committed by GitHub
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library/alloc/src/vec/is_zero.rs
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@ -73,7 +73,7 @@ unsafe impl<T: ?Sized> IsZero for Option<Box<T>> {
// `Option<num::NonZeroU32>` and similar have a representation guarantee that
// they're the same size as the corresponding `u32` type, as well as a guarantee
// that transmuting between `NonZeroU32` and `Option<num::NonZeroU32>` works.
// While the documentation officially makes in UB to transmute from `None`,
// While the documentation officially makes it UB to transmute from `None`,
// we're the standard library so we can make extra inferences, and we know that
// the only niche available to represent `None` is the one that's all zeros.