[meta] switch to once_cell impls in std #7580
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sunshowers
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`once_cell` is now part of std, so switch over to it almost everywhere, and add lints for it. This is purely mechanical -- there are no semantic changes compared to `once_cell`. There's one place that still needs `once_cell`'s `try_`, so keep that around. See rust-lang/rust#109737.
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once_cellis now part of std, so switch over to it almost everywhere, and add lints for it.This is purely mechanical -- there are no semantic changes compared to
once_cell.There's one place that still needs
once_cell'stry_, so keep that around. See rust-lang/rust#109737.