[stdcompat] Fix optional_test.cc for C++20

The default constructor is required here to make sure all non-static
data members are initialized (or else the assignment operators can't be
constexpr).

Test: stdcompat-tests

Change-Id: I8c69c5c1f9f8f4106d387932f8e41ba76bdcbed1
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/474406
Commit-Queue: Mark Schott <schottm@google.com>
Reviewed-by: Corey Tabaka <eieio@google.com>
Reviewed-by: Gianfranco Valentino <gevalentino@google.com>
1 file changed
tree: 5866e5c9d63a61116b6d8c1081b77cb70514a822
  1. .clang-format
  2. .clang-tidy
  3. .git-blame-ignore-revs
  4. .gitattributes
  5. .gitignore
  6. .gn
  7. .style.yapf
  8. AUTHORS
  9. BUILD.gn
  10. CODE_OF_CONDUCT.md
  11. CONTRIBUTING.md
  12. LICENSE
  13. OWNERS
  14. PATENTS
  15. README.md
  16. boards/
  17. build/
  18. buildtools/
  19. bundles/
  20. docs/
  21. examples/
  22. garnet/
  23. products/
  24. rustfmt.toml
  25. scripts/
  26. sdk/
  27. src/
  28. third_party/
  29. tools/
  30. zircon/
README.md

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