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The implementation is already complete but this updates the docs and adds tests for the feature test macro. * doc/xml/manual/status_cxx2020.xml: Update status. * doc/html/*: Regenerate. * testsuite/std/concepts/1.cc: New test. * testsuite/std/concepts/2.cc: New test. From-SVN: r277371
The HTML documentation in this folder is generated from the XML sources. To change or edit, please edit the XML sources in the ../xml directory.