[libcxx-commits] [libcxx] [libc++] Partially implement P2846R6: `reserve_hint` (PR #206385)

[via libcxx-commits]

inquisitivecrystal wrote:

I'm going over the build failures. They mostly seem to be missing includes, which I'll obviously fix. I'm a little confused by this one though:

```
/home/tcwg-buildbot/worker/linaro-armv8-libcxx-01/llvm-project/libcxx-ci/libcxx/test/std/ranges/range.adaptors/range.common.view/types.h:126:5: error: 'TEST_STD_VER' is not defined, evaluates to 0 [-Werror,-Wundef]
# |   126 | #if TEST_STD_VER >= 26
```

I was under the impression that `TEST_STD_VER` was injected into tests, the same way `_LIBCPP_STD_VER` is into the actually library. Is the fact that `types.h` is a header somehow causing problems? I feel like I'm missing something important here. 

https://github.com/llvm/llvm-project/pull/206385