Fix parse expression "a ~ b"

This fixes an infinite loop that I introduced in the parser
on Wed Feb 27 commit 8f12d634fea19d42c363bef65cffd5582a3997ec
when adding support for the "!" NNBD postfix assert non-null operator.

To the best of my knowledge, this problem only manifests
when parsing the expression "a ~ b".

Fix https://github.com/dart-lang/sdk/issues/36255

Change-Id: If20f45620eee0f7cf9b4b6a93640bd3b921d23b9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97265
Reviewed-by: Paul Berry <paulberry@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
2 files changed
tree: 2a960934e53949813b91ba7c2e30751778da7a74
  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
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