[llvm-bugs] [Bug 148179] P2781R9: `std::constant_wrapper`

[LLVM Bugs via llvm-bugs]

Issue	148179
Summary	P2781R9: `std::constant_wrapper`
Labels	libc++, c++26, wg21 paper
Assignees
Reporter	frederick-vs-ja

    **Link:** https://wg21.link/P2781R9

Feature-test macro
```c++
#define __cpp_lib_constant_wrapper 202506L // freestanding, also in <type_traits>
```

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