Use CantReadFile in ProcessedOptions

This ensures that we use the same error message when a file is missing.
Also, we handle FormatException in packages configuration files better.

Change-Id: I6e4c063131ca142643e5a49827f105ba0e23d1b0
Reviewed-on: https://dart-review.googlesource.com/74441
Reviewed-by: Aske Simon Christensen <askesc@google.com>
Commit-Queue: Peter von der Ahé <ahe@google.com>
6 files changed
tree: c36753a820b0ec3959ef0c6108e145da23310b44
  1. .clang-format
  2. .gitattributes
  3. .gitconfig
  4. .github/
  5. .gitignore
  6. .gn
  7. .mailmap
  8. .packages
  9. AUTHORS
  10. BUILD.gn
  11. CHANGELOG.md
  12. CONTRIBUTING.md
  13. DEPS
  14. LICENSE
  15. PATENTS
  16. PRESUBMIT.py
  17. README.dart-sdk
  18. README.md
  19. WATCHLISTS
  20. build/
  21. client/
  22. codereview.settings
  23. dartdoc_options.yaml
  24. docs/
  25. pkg/
  26. runtime/
  27. samples-dev/
  28. samples/
  29. sdk/
  30. tests/
  31. third_party/
  32. tools/
  33. utils/
README.md

Dart

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