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Allow user-declared operator !.

featureProposed language feature that solves one or more problems Proposed language feature that solves one or more problems

Status: Open.

#4767 In dart-lang/language;

· lrhn opened on Sep 4, 2026

Declarations for members: a typedef-like mechanism for deprecating renamed constructors and other declarations

featureProposed language feature that solves one or more problems Proposed language feature that solves one or more problems

Status: Open.

#4766 In dart-lang/language;

· stan-at-work opened on Sep 4, 2026

Should we remove type annotation inference from augmentations?

augmentationsIssues related to the augmentations proposal. Issues related to the augmentations proposal.

Status: Open.

#4764 In dart-lang/language;

· munificent opened on Sep 2, 2026

Automatic type-parameter matching promotion

featureProposed language feature that solves one or more problems Proposed language feature that solves one or more problems

type-inferenceType inference, issues or improvements Type inference, issues or improvements

Status: Open.

#4759 In dart-lang/language;

· lrhn opened on Aug 31, 2026

Simplify promotion chain join

flow-analysisDiscussions about possible future improvements to flow analysis Discussions about possible future improvements to flow analysis

Status: Open.

#4757 In dart-lang/language;

· stereotype441 opened on Aug 28, 2026

Invariant collections

featureProposed language feature that solves one or more problems Proposed language feature that solves one or more problems

varianceIssues concerned with explicit variance Issues concerned with explicit variance

Status: Open.

#4755 In dart-lang/language;

· eernstg opened on Aug 27, 2026

Allow non-specified promotion of union with type parameter?

flow-analysisDiscussions about possible future improvements to flow analysis Discussions about possible future improvements to flow analysis

questionFurther information is requested Further information is requested

Status: Open.

#4747 In dart-lang/language;

· eernstg opened on Aug 18, 2026

[dart 4.0] Drop support for dart_internal

dart-4.0Features considered for the Dart 4.0 release. Features considered for the Dart 4.0 release.

Status: Open.

#4744 In dart-lang/language;

· munificent opened on Aug 10, 2026

Don't promote to Null

flow-analysisDiscussions about possible future improvements to flow analysis Discussions about possible future improvements to flow analysis

Status: Open.

#4742 In dart-lang/language;

· stereotype441 opened on Aug 7, 2026

[augmentations] What is available to obtain the declared types of an introductory declaration?

augmentationsIssues related to the augmentations proposal. Issues related to the augmentations proposal.

questionFurther information is requested Further information is requested

Status: Open.

#4738 In dart-lang/language;

· eernstg opened on Jul 29, 2026

In augmentations, don't combine scopes before lexical resolution

augmentationsIssues related to the augmentations proposal. Issues related to the augmentations proposal.

Status: Open.

#4737 In dart-lang/language;

· stereotype441 opened on Jul 29, 2026

Bottom type queries do not promote, shouldn't they?

flow-analysisDiscussions about possible future improvements to flow analysis Discussions about possible future improvements to flow analysis

questionFurther information is requested Further information is requested

specification

Status: Open.

#4736 In dart-lang/language;

· eernstg opened on Jul 29, 2026