avoid_shadowing_type_parameters

The type parameter '{0}' shadows a type parameter from the enclosing {1}.

The analyzer produces this diagnostic when a type parameter shadows a type parameter from an enclosing declaration.

Shadowing a type parameter with a different type parameter can lead to subtle bugs that are difficult to debug.

The following code produces this diagnostic because the type parameter T defined by the method m shadows the type parameter T defined by the class C:

class C<T> {
  void m<T>() {}
}

Rename one of the type parameters:

class C<T> {
  void m<S>() {}
}

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.