on_repeated
The type '{0}' can be included in the superclass constraints only once.
Description
#The analyzer produces this diagnostic when the same type is listed in the superclass constraints of a mixin multiple times.
Example
#
The following code produces this diagnostic because A is included twice
in the superclass constraints for M:
dart
mixin M on A, A {
}
class A {}
class B {}
Common fixes
#If a different type should be included in the superclass constraints, then replace one of the occurrences with the other type:
dart
mixin M on A, B {
}
class A {}
class B {}
If no other type was intended, then remove the repeated type name:
dart
mixin M on A {
}
class A {}
class B {}