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Rollup merge of #111654 - JoJoJet:unsafe-cell-from-mut-lib, r=joshtriplett

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Add a conversion from `&mut T` to `&mut UnsafeCell<T>`

Provides a safe way of downgrading an exclusive reference into an alias-able `&UnsafeCell<T>` reference.

ACP: https://github.com/rust-lang/libs-team/issues/198.
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Dylan DPC 2023-05-17 11:13:57 +05:30 • committed by GitHub
commit 71fdb95272
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compiler/rustc_span/src/symbol.rs
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@ -1584,6 +1584,7 @@ symbols! {
unrestricted_attribute_tokens,
unsafe_block_in_unsafe_fn,
unsafe_cell,
unsafe_cell_from_mut,
unsafe_no_drop_flag,
unsafe_pin_internals,
unsize,