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The printer was confused when unique_ptr<T,D>::pointer is an empty class, or the deleter is not empty. Instead of assuming the tuple has a single _M_head_impl member manually inspect the tuple base classes to get the first element. * python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__): Do not assume field called _M_head_impl is the first tuple element. * testsuite/libstdc++-prettyprinters/compat.cc: Make tuple implementation more accurate. * testsuite/libstdc++-prettyprinters/cxx11.cc: Check unique_ptr with empty pointer type and non-empty deleter. From-SVN: r271159