Johnni Winther
9be682a950
This adds support for constant evaluation of null aware access of length on null. Null aware access of length on String was already supported in both analyzer and CFE, and the spec has been updated to support it. Closes #60509 Change-Id: Ie7e26d3e969bc82f5c65147f243350fbf4c68e67 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/429921 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>