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Add note about !Sync (#2138)

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This is key to the validity of how Cell and RefCell allow safe interior
mutability.
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Andrew Walbran 2024-06-10 15:35:13 +01:00 committed by GitHub
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src/borrowing/interior-mutability.md
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@ -71,4 +71,8 @@ that safety, and `RefCell` and `Cell` are two of them.
`&self`. This needs no runtime check, but requires moving values, which can
have its own cost.
- Both `RefCell` and `Cell` are `!Sync`, which means `&RefCell` and `&Cell`
can't be passed between threads. This prevents two threads trying to access
the cell at once.
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