[Bug libstdc++/115939] Cannot unambiguously compare iterators in std::unordered_map with mapped type std::expected<std::any, Y>>

[de34 at live dot cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115939

Jiang An <de34 at live dot cn> changed:

           What    |Removed                     |Added
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                 CC|                            |de34 at live dot cn

--- Comment #4 from Jiang An <de34 at live dot cn> ---
(In reply to Jonathan Wakely from comment #3)

> I'll get to work on the std::expected proposal (which I expect will get
> treated as a DR for C++23 by all implementers, certainly in libstdc++). Once
> I've drafted that proposal, I'll push the corresponding code changes to
> libstdc++.

It seems to me that it's still needed to fix operator== for container iterators
after patching std::expected. IIUC the current standard wording doesn't allow
such iterator comparison to be hacked.