test_ types_ in_ equals
Missing type test for '{0}' in '=='.
Description
#
The analyzer produces this diagnostic when an override of the
==
operator doesn't include a type test on the value of the parameter.
Example
#
The following code produces this diagnostic because
other
is not type
tested:
class C {
final int f;
C(this.f);
@override
bool operator ==(Object other) {
return (other as C).f == f;
}
}
Common fixes
#Perform an is
test as part of computing the return value:
class C {
final int f;
C(this.f);
@override
bool operator ==(Object other) {
return other is C && other.f == f;
}
}
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.