Implement Box::as_non_null().#157347
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ACP: <rust-lang/libs-team#799> Tracking issue: <rust-lang#157345> The docs are mostly copied from `Box::as_mut_ptr()`
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ACP: rust-lang/libs-team#799
Tracking issue: #157345
The docs are mostly copied from
Box::as_mut_ptr()I also made a drive-by change to add
#[must_use]toBox::as_{ptr, mut_ptr}.I'm unsure what
#[rustc_never_returns_null_ptr]and#[rustc_as_ptr]do. ShouldBox::as_non_null()be annotated with them?r? libs-api