[flow analysis] Don't clear types of interest on full demotion. Previously, when assiging to a local variable that was promoted, if the newly assigned value was not compatible with any of the promotions (i.e., the variable was fully demoted back to its declared type), then the set of types of interest was cleared. This behavior was not documented anywhere in the spec, and it seems oddly inconsistent to me; as far as I can tell, flow analysis doesn't clear types of interest in any other circumstances. I've looked through git history as well as my personal notes, and I've been unable to find any justification for this behavior. So, with the agreement of the language team, I'm removing it when sound-flow-analysis is enabled. Fixes https://github.com/dart-lang/language/issues/4380. Bug: https://github.com/dart-lang/language/issues/4380 Change-Id: Ic1ca80a61e21482e659afa8796b08fce707db3c5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/429227 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
Dart is:
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