Nested unnamed namespace?

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Unnamed namespace could be considered as a normal namespace with unique name which you do not know. According to C++ Standard 7.3.1.1:

An unnamed-namespace-definition behaves as if it were replaced by

  namespace unique { /* empty body */ }
  using namespace unique;
  namespace unique { namespace-body }

where all occurrences of unique in a translation unit are replaced by the same identifier and this identifier differs from all other identifiers in the entire program.

There are no additional issues.

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