pkg/front_end/testcases/extension_types/issue54625_2.dart.textual_outline.expect

X Function<X extends E>() foo() => throw 0;

class A<Supertype, Subtype extends Supertype> {}

A<X, Null> Function<X extends E>() test1() => throw 0;

A<Object, X> Function<X extends E>() test2() => throw 0;

extension type E(num it) implements num {}

Null returnsNull<Y extends E>() => null;

test3() {}