|author||Paul Berry <email@example.com>||Mon Jul 18 14:51:24 2022 +0000|
|committer||Commit Bot <firstname.lastname@example.org>||Mon Jul 18 14:51:24 2022 +0000|
Flow analysis: clarify behavior of ifNullExpression_rightBegin. Previously, it was unclear what information was stored in _IfNullExpressionContext._previous. It turned out that it was the "shortcut state", i.e. the flow state if the LHS of the `??` was non-`null`. I've renamed variables and added comments to clarify this. Also, based on the implementation of `ifNullExpression_rightBegin`, it looked like it might update `_current`, but in fact it did not (because `tryMarkNonNullable` always returns an `ExpressionInfo` whose `ifFalse` is unchanged); I've refactored the code so that this is clearer, and added a comment explaining why it is the right thing to do. Bug: https://github.com/dart-lang/language/issues/2020 Change-Id: Ib8a5235f9b9482f4b290ad90686385514660a95d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/251142 Reviewed-by: Johnni Winther <email@example.com> Commit-Queue: Paul Berry <firstname.lastname@example.org> Reviewed-by: Konstantin Shcheglov <email@example.com>
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