std: refactor explanation of NonNull
#141946
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Streamlined the explanation of covariance for `NonNull<T>`, focusing on practical usage and reducing scary explanation. Added a concise example for cases where invariance is required, showing how to use `PhantomData<Cell<T>> Signed-off-by: xizheyin <[email protected]>
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I've avoided big changes this time, removing some of the “scary” descriptions and replacing them with more practical advice, and adding more specific explanations for the examples. |
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Fixes #141933
I cut out the excessive explanation and used an example to explain how to maintain invariance, but I think what is quoted in the rust reference in the document needs to be added with a more layman's explanation and example.
(I'm not sure if I deleted too much)
r? @workingjubilee