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from 91902bb4253 PR c++/88538 - braced-init-list in template-argument-list. [...] adds 58e897da03b PR libstdc++/87855 fix optional for types with non-trivial [...]

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Summary of changes: libstdc++-v3/ChangeLog | 27 + libstdc++-v3/include/std/optional | 754 ++++++--------------- libstdc++-v3/python/libstdcxx/v6/printers.py | 24 +- .../testsuite/libstdc++-prettyprinters/compat.cc | 76 +++ 4 files changed, 323 insertions(+), 558 deletions(-) create mode 100644 libstdc++-v3/testsuite/libstdc++-prettyprinters/compat.cc