Add const_cell_into_inner to OnceCell
#129382
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`Cell` and `RefCell` have their `into_inner` methods const unstable. `OnceCell` has the same logic, so add it under the same gate. Tracking issue: rust-lang#78729
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…r, r=Noratrieb Add `const_cell_into_inner` to `OnceCell` `Cell` and `RefCell` have their `into_inner` methods const unstable. `OnceCell` has the same logic, so add it under the same gate. Tracking issue: rust-lang#78729
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#128432 (WASI: forbid `unsafe_op_in_unsafe_fn` for `std::{os, sys}`) - rust-lang#129373 (Add missing module flags for CFI and KCFI sanitizers) - rust-lang#129374 (Use `assert_unsafe_precondition!` in `AsciiChar::digit_unchecked`) - rust-lang#129376 (Change `assert_unsafe_precondition` docs to refer to `check_language_ub`) - rust-lang#129382 (Add `const_cell_into_inner` to `OnceCell`) - rust-lang#129387 (Advise against removing the remaining Python scripts from `tests/run-make`) - rust-lang#129388 (Do not rely on names to find lifetimes.) - rust-lang#129395 (Pretty-print own args of existential projections (dyn-Trait w/ GAT constraints)) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#129382 - tgross35:once-cell-const-into-inner, r=Noratrieb Add `const_cell_into_inner` to `OnceCell` `Cell` and `RefCell` have their `into_inner` methods const unstable. `OnceCell` has the same logic, so add it under the same gate. Tracking issue: rust-lang#78729
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CellandRefCellhave theirinto_innermethods const unstable.OnceCellhas the same logic, so add it under the same gate.Tracking issue: #78729
Since this is a minimal consistency change to unstable API:
r? libs