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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/104465] std::vector<std::string> should satisfy
 std::ranges::viewable_range (P2415 for -c++2b)
Date: Wed, 09 Feb 2022 13:35:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104465

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Younan Zhang from comment #0)
> Clang 13 rejects the above code (https://gcc.godbolt.org/z/xoKesEz7q), wh=
ich
> is as expected.

That's just because Clang is broken and doesn't work with any libstdc++ vie=
ws:
https://github.com/llvm/llvm-project/issues/44178

So there are several things going on here. You're correct that P2415 is not
implemented, but I think your example is supposed to compile even before th=
at
change. An lvalue vector has always been a viewable range. Clang 13 rejects
your example because it's broken, not because of the viewable_range
requirement.=