recursive_constructor_redirect

Constructors can't redirect to themselves either directly or indirectly.

The analyzer produces this diagnostic when a constructor redirects to itself, either directly or indirectly, creating an infinite loop.

The following code produces this diagnostic because the generative constructors C.a and C.b each redirect to the other:

class C {
  C.a() : this.b();
  C.b() : this.a();
}

The following code produces this diagnostic because the factory constructors A and B each redirect to the other:

abstract class A {
  factory A() = B;
}
class B implements A {
  factory B() = A;
  B.named();
}

In the case of generative constructors, break the cycle by finding defining at least one of the constructors to not redirect to another constructor:

class C {
  C.a() : this.b();
  C.b();
}

In the case of factory constructors, break the cycle by defining at least one of the factory constructors to do one of the following:

• Redirect to a generative constructor:

abstract class A {
  factory A() = B;
}
class B implements A {
  factory B() = B.named;
  B.named();
}

• Not redirect to another constructor:

abstract class A {
  factory A() = B;
}
class B implements A {
  factory B() {
    return B.named();
  }

  B.named();
}

• Not be a factory constructor:

abstract class A {
  factory A() = B;
}
class B implements A {
  B();
  B.named();
}

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.