Rollup of 8 pull requests #69463
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Rollup of 8 pull requests #69463
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Usually, references to the interior are only created by the `Deref` and
`DerefMut` impl of the guards `Ref` and `RefMut`. Note that `RefCell`
already has to cope with leaks of such guards which, when it occurs,
effectively makes it impossible to ever acquire a mutable guard or any
guard for `Ref` and `RefMut` respectively. It is already safe to use
this to create a reference to the inner of the ref cell that lives as
long as the reference to the `RefCell` itself, e.g.
```rust
fn leak(r: &RefCell<usize>) -> Option<&usize> {
let guard = r.try_borrow().ok()?;
let leaked = Box::leak(Box::new(guard));
Some(&*leaked)
}
```
The newly added methods allow the same reference conversion without an
indirection over a leaked allocation and composing with both borrow and
try_borrow without additional method combinations.
This re-exports the primitive types from libcore at `core::primitive` to allow macro authors to have a reliable location to use them from.
…olnay Add primitive module to libcore This re-exports the primitive types from libcore at `core::primitive` to allow macro authors to have a reliable location to use them from. Fixes rust-lang#44865
…tolnay
Add methods to 'leak' RefCell borrows as references with the lifetime of the original reference
Usually, references to the interior are only created by the `Deref` and
`DerefMut` impl of the guards `Ref` and `RefMut`. Note that `RefCell`
already has to cope with leaks of such guards which, when it occurs,
effectively makes it impossible to ever acquire a mutable guard or any
guard for `Ref` and `RefMut` respectively. It is already safe to use
this to create a reference to the inner of the ref cell that lives as
long as the reference to the `RefCell` itself, e.g.
```rust
fn leak(r: &RefCell<usize>) -> Option<&usize> {
let guard = r.try_borrow().ok()?;
let leaked = Box::leak(Box::new(guard));
Some(&*leaked)
}
```
The newly added methods allow the same reference conversion without an
indirection over a leaked allocation. It's placed on the `Ref`/`RefMut` to
compose with both borrow and try_borrow directly.
…acrum debug_assert a few more raw pointer methods Fixes rust-lang#53871
…crum Deduplicate identifier printing a bit rust-lang#67010 introduced a couple more subtly different ways to print an identifier. This PR attempts to restore the order. The most basic identifier printing interface is `Formatter`-based now, so `String`s are not allocated unless required. r? @Mark-Simulacrum
syntax: Remove `Nt(Impl,Trait,Foreign)Item` Follow-up to rust-lang#69366. r? @Centril
remove redundant clones and import
…bank Minor refactoring of statement parsing Extracted out of rust-lang#69445. r? @estebank
…, r=Dylan-DPC Clean up e0370 e0371 r? @Dylan-DPC
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@bors r+ rollup=never p=8 |
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📌 Commit 6e392e2 has been approved by |
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⌛ Testing commit 6e392e2 with merge f81b3bb9764dc39151666f137db4666aeee6f452... |
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💔 Test failed - checks-azure |
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Successful merges:
Nt(Impl,Trait,Foreign)Item#69423 (syntax: RemoveNt(Impl,Trait,Foreign)Item)Failed merges:
r? @ghost