cc9040245b
- Use literals instead of Map/Set constructors. - Make more use of inferred type arguments. - Rewrite some conditionals to use `??`. Change-Id: Ifb844226e29ccedb2b1b409e8e4f99bbdb96cfe5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212401 Commit-Queue: Stephen Adams <sra@google.com> Reviewed-by: Mayank Patke <fishythefish@google.com>