super_invocation_not_last

(Previously known as invalid_super_invocation)

The superconstructor call must be last in an initializer list: '{0}'.

The analyzer produces this diagnostic when the initializer list of a constructor contains an invocation of a constructor in the superclass, but the invocation isn't the last item in the initializer list.

The following code produces this diagnostic because the invocation of the superclass' constructor isn't the last item in the initializer list:

class A {
  A(int x);
}

class B extends A {
  B(int x) : super(x), assert(x >= 0);
}

Move the invocation of the superclass' constructor to the end of the initializer list:

class A {
  A(int x);
}

class B extends A {
  B(int x) : assert(x >= 0), super(x);
}

Unless stated otherwise, the documentation on this site reflects Dart 3.8.1. Page last updated on 2025-05-08. View source or report an issue.