Strike "with concepts support" from the GH-1814 messages

[CaseyCarter]

Our supported C++latest frontends (clang-cl and msvc) both have concepts support, so this appears redundant.

Fixes DevCom-1603100
Closes VSO-1445646 / AB#1445646

[StephanTLavavej]

I don't understand - we support EDG in c++latest mode, but it lacks full support for concepts, so we exclude format/ranges/etc.

Is the theory here that because we treat EDG-for-STL-testing and EDG-for-IntelliSense differently (where we activate concepts anyways, by special request), that users are confused by the "with concepts support" part? If so, this change would make sense to me, but I think the PR description should mention this.

[CaseyCarter]

I don't understand - we support EDG in c++latest mode, but it lacks full support for concepts, so we exclude format/ranges/etc.

Is the theory here that because we treat EDG-for-STL-testing and EDG-for-IntelliSense differently (where we activate concepts anyways, by special request), that users are confused by the "with concepts support" part? If so, this change would make sense to me, but I think the PR description should mention this.

The issue is that C++20 has been published, so today "C++latest" means "support for C++ beyond C++20." The set of compilers that support C++20 and Concepts is the same as the set that supports C++20, so "C++latest and Concepts" is redundant. The fact that EDG-for-STL-testing doesn't fully support C++20 is enough to rule it out of "C++latest" even absent a specific "and concepts" requirement.

[StephanTLavavej]

Ok, thanks for explaining. I think we have different interpretations of what "c++latest mode" means (to me, EDG-for-STL-testing supports a /std:c++latest mode, it just happens to lack concepts support, so it's not truly conformant to either C++20 or C++23), but I'm happy to rephrase this message anyways.

[CaseyCarter]

Ok, thanks for explaining. I think we have different interpretations of what "c++latest mode" means

I think my interpretation is actually closer to yours, I'm projecting here what I believe to be a very common customer perspective that this particular DevCom submitter represents.

[fsb4000]

I will update #2061 similarly when your PR will be merged.

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

[StephanTLavavej]

Thanks for improving these diagnostics! 📖 💡 😸