P3450R1: Extend `std::is_within_lifetime`
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c++26
libc++
wg21-paper
- Dominant language
- LLVM
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Description
**Link:** https://wg21.link/P3450R1
Feature-test macro (updated):
```c++
#define __cpp_lib_is_within_lifetime 202603L // freestanding, also in
```
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