Fix error in CancelableOperation.then (#127)

Replace a dynamic null check with a dynamic type cast, since the target type may be nullable.
1 file changed
tree: 9e4be15898c0b7472463afeb591244a565e9cd0d
  1. .gitignore
  2. .test_config
  3. .travis.yml
  4. AUTHORS
  5. CHANGELOG.md
  6. CONTRIBUTING.md
  7. LICENSE
  8. README.md
  9. analysis_options.yaml
  10. lib/
  11. pubspec.yaml
  12. test/
README.md

Contains utility classes in the style of dart:async to work with asynchronous computations.