illegal_concrete_enum_member
A concrete instance member named '{0}' can't be declared in a class that implements 'Enum'.
A concrete instance member named '{0}' can't be inherited from '{1}' in a class that implements 'Enum'.
Description
#The analyzer produces this diagnostic when either an enum declaration, a class that implements Enum
, or a mixin with a superclass constraint of Enum
, declares or inherits a concrete instance member named either index
, hashCode
, or ==
.
Examples
#The following code produces this diagnostic because the enum E
declares an instance getter named index
:
enum E {
v;
int get index => 0;
}
The following code produces this diagnostic because the class C
, which implements Enum
, declares an instance field named hashCode
:
abstract class C implements Enum {
int hashCode = 0;
}
The following code produces this diagnostic because the class C
, which indirectly implements Enum
through the class A
, declares an instance getter named hashCode
:
abstract class A implements Enum {}
abstract class C implements A {
int get hashCode => 0;
}
The following code produces this diagnostic because the mixin M
, which has Enum
in the on
clause, declares an explicit operator named ==
:
mixin M on Enum {
bool operator ==(Object other) => false;
}
Common fixes
#Rename the conflicting member:
enum E {
v;
int get getIndex => 0;
}
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.