6384f629c0
This adds a new "conflicting modifiers" error code for new NNBD modifier errors and replaces the existing "const and var" error code with the new error code. Change-Id: I1997bbb7f66e62d2de3c5042b6ea85861f2e00d8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99760 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Dan Rubel <danrubel@google.com>