bca554fcf4
+ add a modifier to the "variable" used for import prefixes. Change-Id: If448c3a481a3471a63b58455acaef4ebcfd1f37c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/217981 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>