| commit | 3a1cc9faf6ea8c4b5b552092dcd0145d366d3937 | [log] [tgz] |
|---|---|---|
| author | Paul Berry <paulberry@google.com> | Mon Dec 12 19:15:53 2022 +0000 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Mon Dec 12 19:15:53 2022 +0000 |
| tree | aa6643088fed37cfe69c97638a10e4d71c7b9049 | |
| parent | 1e0091aae0ed8a05e280e7187231e414988d1ccf [diff] |
Flow analysis: update exhaustiveness logic for patterns. When patterns support is disabled, flow analysis considers a switch statement to be exhaustive if it has a `default` clause or if the scrutinee type was an enum and all enum cases were covered (this matches the behaviour of previous releases of Dart). When patterns support is enabled, flow analysis considers a switch statement to be exhaustive if it has a `default` clause or if the scrutinee type is an "exhaustive type" (as defined in the patterns spec). A later stage of analysis will check that such switch statements truly are exhaustive, and issue a compile-time error if they aren't. Note that as part of this change I've modified the analyzer so that it only attempts to track whether all enum cases are covered if patterns support is disabled. I didn't make a corresponding change to the CFE because the CFE stores exhaustiveness information in the kernel output (`SwitchStatement.isExplicitlyExhaustive`) and I didn't want to break that. Bug: https://github.com/dart-lang/sdk/issues/50419 Change-Id: Ib2e51971a1b814c003401b3d54d41f7a9ef9f59a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/274720 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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