Skip to content

#3057. Update promotion_via_assignment_A03_t02.dart according to the implementation #3168

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
May 5, 2025
Merged

#3057. Update promotion_via_assignment_A03_t02.dart according to the implementation #3168

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 4 additions & 6 deletions TypeSystem/flow-analysis/promotion_via_assignment_A03_t02.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11,20 +11,18 @@
/// - and `T <: S` and not `S <: T`
/// - and `T` is a type of interest for `x` in `tested`
///
/// @description Checks that if `T` is not subtype of `S` then promotion via
/// assignment cannot be performed.
/// @description Checks that if the declared type of a variable `x` is `S`,
/// `T1 <: S` and `T2 <: S`, the current type of `x` is `T1` then assignment to
/// `x` value of the type `T2` demotes `x` to `S` and promotes to `T2`.
/// @author sgrekhov22@gmail.com
/// @issue 60646

main() {
Object? s = "Some string";
s as String; // `s` promoted to `String`
if (s is int) {} // Make `int` a type of interest for `s`.
s = 42; // `s` demoted to `Object`
s = 42; // `s` demoted to `Object?` and promoted to `int`
s.isEven;
// ^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
s.substring(0);
// ^^^^^^^^^
// [analyzer] unspecified
Expand Down