cherry pick dart-lang/sdk@ac4de98 to stable branch #43013
Labels
area-front-end
Use area-front-end for front end / CFE / kernel format related issues.
cherry-pick-approved
Label for approved cherrypick request
cherry-pick-review
Issue that need cherry pick triage to approve
merge-to-stable
commit(s) to merge: ac4de98
merge instructions: The change does not merge cleanly, please see
https://dart-review.googlesource.com/c/sdk/+/158102 for a patch CL
What is the issue: Applications run into the following unhandled exception
Unsupported operation: serialization of generic DartType: UnknownType(?) (UnknownType)
What is the fix: CFE Eliminates UnknownType in async type downcasts
Why cherrypick: A number of flutter users (almost 21 upvotes for the issue) have run into this issue, please see
flutter/flutter#63038
Risk: The fix landed in the Dart tree on Jul 14th and has been rolled into bleeding edge Flutter. It has been in the
bleeding edge branch for over 3 weeks now and the risk is pretty low.
Number of lines of code change 2 and there is a CFE unit test case for the change.
Link to original issue(s):
Flutter : flutter/flutter#63038
Dart : #42615
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