| Issue |
108011
|
| Summary |
[clang][libc++] std::expected not available until clang 20
|
| Labels |
clang,
libc++
|
| Assignees |
|
| Reporter |
dawmd
|
The following code doesn't compile until clang 20:
```cpp
#include <expected>
using type = std::expected<int, int>;
```
The compiler reports the following error (when using `-std=gnu++23`):
```
<source>:3:14: error: use of undeclared identifier 'std'
3 | using type = std::expected<int, int>;
| ^
```
According to [the reference for C++23 support in libc++](https://libcxx.llvm.org/Status/Cxx23.html), `std::expected` has been supported in clang 16 onward.
It seems as though the feature macro isn't defined in the previous versions for some reason.
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