Force proj_vis to pub(crate) if visibility cannot be parsed due to rustc bug#79

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taiki-e wants to merge 2 commits intomainfrom vis

+48-83

Commits on Aug 9, 2023

Force proj_vis to pub(crate) if visibility cannot be parsed due to rustc bug
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Revert "Add #[doc(hidden)] to projected types/methods to mitigate impact of rustc bug (#80 )"
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