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Reference (section label): [expr.const]

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Issue description:

25.2 includes in the category of immediate-escalating functions "a defaulted special member function that is not declared with the consteval specifier". This omits defaulted comparison operators, which presumably should also be immediate-escalating, and all the implementations seem to agree (https://godbolt.org/z/dG5sxbacP).

Suggested resolution:

Remove "special member" so that any defaulted function is included.