607b370933
A desired feature for flow analysis of patterns is that the matched
value type of one subpattern may depend on promotions from previous
patterns. For example, we want this to work:
int? x = ...;
if (x case null || < 0) ...;
This means that although the type of the scrutinee is `int?`, after
the subpattern `null` has been processed, type promotion should
promote the matched value type to `int`, so that the subpattern `< 0`
doesn't report an error.
This requires changing the API of the shared patterns analysis logic,
so that the client is no longer responsible for passing around the
matched value type. Instead, flow analysis keeps track of it and
provides it to the client when requested.
In follow-up CLs I'll add the necessary logic to flow analysis to
actually promote the matched value type in situations like the example
above.
Change-Id: I6ce66962af32f9bd93bfe4082ba256de627d3cc6
Bug: https://github.com/dart-lang/sdk/issues/50419
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/274942
Commit-Queue: Paul Berry <paulberry@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
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| third_party | ||
| tools | ||
| utils | ||
| .clang-format | ||
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| AUTHORS | ||
| BUILD.gn | ||
| CHANGELOG.md | ||
| codereview.settings | ||
| CONTRIBUTING.md | ||
| DEPS | ||
| LICENSE | ||
| OWNERS | ||
| PATENT_GRANT | ||
| PRESUBMIT.py | ||
| README.dart-sdk | ||
| README.md | ||
| sdk_args.gni | ||
| SECURITY.md | ||
| WATCHLISTS | ||
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