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NonZeroUsize should implement TryFrom<usize> #73664

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@larsluthman

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@larsluthman

std::num::NonZeroUsize does not implement the trait std::convert::TryFrom<usize>, and the same goes for all the other NonZero types - they don't implement TryFrom conversions from their inner type. This seems to be exactly the sort of situation that TryFrom was created for, so they probably should.

The NonZeroUsize::new() method already does something similar by returning None if the value is zero, but having TryFrom would be nice for consistency and for generic code.

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    C-enhancementCategory: An issue proposing an enhancement or a PR with one.T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.

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