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__COUNTER__ is used heavily by Boost.Test and clang 22 started to complain about it.

  ../tests/benchmarks/encoding.cpp:94:1: error: '__COUNTER__' is a C2y extension [-Werror,-Wc2y-extensions]
     94 | BOOST_AUTO_TEST_CASE_TEMPLATE(ReadVarNumber, Test, ReadVarNumberTests)
        | ^
  /usr/include/boost/test/unit_test_suite.hpp:265:73: note: expanded from macro 'BOOST_AUTO_TEST_CASE_TEMPLATE'
    265 | #define BOOST_AUTO_TEST_CASE_TEMPLATE( test_name, type_name, TL )       \
        |                                                                         ^
  /usr/include/boost/test/unit_test_suite.hpp:250:73: note: expanded from macro '\
  BOOST_FIXTURE_TEST_CASE_TEMPLATE'
    250 |                                                                         \
        |                                                                         ^
  /usr/include/boost/test/unit_test_suite.hpp:368:68: note: expanded from macro '\
  BOOST_AUTO_TU_REGISTRAR'
    368 | static boost::unit_test::ut_detail::auto_test_unit_registrar       \
        |                                                                    ^
  /usr/include/boost/test/unit_test_suite.hpp:358:45: note: expanded from macro '\
  BOOST_TEST_APPEND_UNIQUE_ID'
    358 |   BOOST_JOIN( BOOST_JOIN( name, __LINE__ ), __COUNTER__)
        |                                             ^
  1 error generated.