Make debug printing of function types more robust.

Sometimes when printing stack states in the outline builder,
a formal in a function type is a FormalParameterBuilder,
and sometimes a formal or the return type is null.

Change-Id: I2bed0baae2a80e894e170a85744e382e763c8944
Reviewed-on: https://dart-review.googlesource.com/58207
Reviewed-by: Peter von der Ahé <ahe@google.com>
Commit-Queue: Aske Simon Christensen <askesc@google.com>
1 file changed
tree: ab41e5556eab15690aaa86797b12cb219befb014
  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. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. dartdoc_options.yaml
  26. DEPS
  27. LICENSE
  28. PATENTS
  29. PRESUBMIT.py
  30. README.dart-sdk
  31. README.md
  32. WATCHLISTS
README.md

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