Huh. I wonder if this is a compiler bug in gcc. Clang doesn't have a problem with this construct, or even warn about it. Weird.
Bug 1895254 Comment 7 Edit History
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Huh. I wonder if this is a compiler bug in gcc. Clang doesn't have a problem with this construct, or even warn about it. Weird. Nope, gcc seems to be in the right here, the standard just says that compilers can choose to ignore it, which clang and MSVC do. Wild.