commit | f04053d767466f057ab5c414cee3e257ea7a8959 | [log] [tgz] |
---|---|---|
author | Paul Berry <paulberry@google.com> | Wed Apr 01 12:07:44 2020 +0000 |
committer | commit-bot@chromium.org <commit-bot@chromium.org> | Wed Apr 01 12:07:44 2020 +0000 |
tree | a5a58e3da218c7e81a674a89908e1b146889a0a1 | |
parent | d6a096cb03f45119876ab0dbde7c445bf635bcb1 [diff] |
Migration: do not union inferred types in overrides. Previously, when handling an override such as: abstract class A { int/*?*/ f(); } class C implements A { f() => 0; } we would create a union edge between the implicit return type of C.f and the explicit return type of A.f. This was a problem because nullability information can propagate bidirectionally through union edges, so it could result in types unnecessarily becoming nullable, e.g.: abstract class A { int/*?*/ f(); } abstract class B { int f(); // Should not need to be made nullable } class C implements A, B { f() => 0; } This CL fixes the problem by just making ordinary unidirectional edges for overrides involving inferred types. Change-Id: I63a5f1f640b5543fcf39304087592e984aa66694 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/141853 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
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