Revert support for simple nullable type return value in generalized function type

This reverts commit 11d081d115c1884ba3af2629839fc8ac66227589

Reason for revert: Breaks parsing less common conditionals (e.g. b ? c = true : g();)

Original change's description:
> Add support for simple nullable type return value in generalized function type
>
> This only supports nullable return values of the form
>
> <identifier> '?' 'Function' '(' ...
>
> This is an increment CL in the ongoing effort to add nullable type support
> as outlined in https://github.com/dart-lang/language/issues/110

Change-Id: I99bce29619d4e448193e3c81fa86a982791b1f77
Reviewed-on: https://dart-review.googlesource.com/c/87283
Reviewed-by: Dan Rubel <danrubel@google.com>
4 files changed
tree: 49b4f40a12b4cea0cfc3b3274db98bd8b09e89b5
  1. .clang-format
  2. .gitattributes
  3. .gitconfig
  4. .github/
  5. .gitignore
  6. .gn
  7. .mailmap
  8. .packages
  9. .vpython
  10. AUTHORS
  11. BUILD.gn
  12. CHANGELOG.md
  13. CONTRIBUTING.md
  14. DEPS
  15. LICENSE
  16. PATENTS
  17. PRESUBMIT.py
  18. README.dart-sdk
  19. README.md
  20. WATCHLISTS
  21. build/
  22. client/
  23. codereview.settings
  24. dartdoc_options.yaml
  25. docs/
  26. pkg/
  27. runtime/
  28. samples-dev/
  29. samples/
  30. sdk/
  31. tests/
  32. third_party/
  33. tools/
  34. utils/
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