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Apply requested API changes to `cell_update` Do the following: * Switch to `impl FnOnce` rather than a generic `F`. * Change `update` to return nothing. This was discussed at a libs-api meeting [1]. Tracking issue: https://github.com/rust-lang/rust/issues/50186 [1]: https://github.com/rust-lang/rust/pull/134446#issuecomment-2770842949