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407de0ee33
Clarify the lifetimes of allocations returned by the `Allocator` trait
The previous definition (accidentally) disallowed the implementation of stack-based allocators whose memory would become invalid once the lifetime of the allocator type ended.
This also ensures the validity of the following blanket implementation:
```rust
impl<A: Allocator> Allocator for &'_ A {}
```
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| .. | ||
| alloc | ||
| backtrace@6145fe6bac | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@5ef6eb42bd | ||
| sysroot | ||
| test | ||
| unwind | ||