class A {}
class B extends A {}
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late
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List<B> xs;
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late
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List<List<B>> xss;
class Class<T extends A> {
  void method1a(T t) {}
  void method1b(T t) {}
  void method2a(T t) {}
  void method2b(T t) {}
}
void errors() {}
void main() {}
void throws(void Function() f) {}