new conflicting-modifiers error code

This adds a new "conflicting modifiers" error code for new NNBD
modifier errors and replaces the existing "const and var" error
code with the new error code.

Change-Id: I1997bbb7f66e62d2de3c5042b6ea85861f2e00d8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99760
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
8 files changed
tree: 60cc2454e5cf0e5f60ed8806dbd2ce93329ef7d1
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

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