must_call_super

This method overrides a method annotated as '@mustCallSuper' in '{0}', but doesn't invoke the overridden method.

The analyzer produces this diagnostic when a method that overrides a method that is annotated as mustCallSuper doesn't invoke the overridden method as required.

The following code produces this diagnostic because the method m in B doesn't invoke the overridden method m in A:

import 'package:meta/meta.dart';

class A {
  @mustCallSuper
  m() {}
}

class B extends A {
  @override
  m() {}
}

Add an invocation of the overridden method in the overriding method:

import 'package:meta/meta.dart';

class A {
  @mustCallSuper
  m() {}
}

class B extends A {
  @override
  m() {
    super.m();
  }
}