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from 2b895374579 [expand] Handle null target in expand_builtin_goacc_parleve [...] new 5fef6f2fd86 PR libstdc++/85642 fix is_nothrow_default_constructible<opt [...]

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Summary of changes: libstdc++-v3/ChangeLog | 13 + libstdc++-v3/include/std/optional | 401 +++++++++++---------- .../testsuite/20_util/optional/cons/85642.cc | 63 ++++ .../testsuite/20_util/optional/cons/value_neg.cc | 6 +- 4 files changed, 282 insertions(+), 201 deletions(-) create mode 100644 libstdc++-v3/testsuite/20_util/optional/cons/85642.cc