'Is there any rule about why is the redefinition of the enumerator ill-formed?

Consider this example

enum class A{
    a = 0,
    a = 1
};

The compilers will report an error, which is the "redefinition of enumerator 'a'". However, [basic.def.odr#1] does not have any requirement for the enumerator

No translation unit shall contain more than one definition of any variable, function, class type, enumeration type, template, default argument for a parameter (for a function in a given scope), or default template argument.

I wonder which normative rule, in the standard, is restricting that?

c++language-lawyer


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