instantiate_abstract_class

Abstract classes can't be instantiated.

The analyzer produces this diagnostic when it finds a constructor invocation and the constructor is declared in an abstract class. Even though you can't create an instance of an abstract class, abstract classes can declare constructors that can be invoked by subclasses.

The following code produces this diagnostic because C is an abstract class:

abstract class C {}

var c = new C();

If there's a concrete subclass of the abstract class that can be used, then create an instance of the concrete subclass.

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.