pkg/front_end/testcases/extension_types/issue54186.dart.textual_outline_modelled.expect

extension type E<X>(F2<X> it) {}

extension type E2<X>(F3<X> it) {}

typedef F<X> = X;

typedef F2<X> = F<F<X>>;

typedef F3<X> = F4<X>;

typedef F4<X> = F4<X>;