fun ([a] T<T>.(A<B>) -> Unit).foo()
fun ([a] T<T>.(A<B>) ->  C<D, E>).foo();
fun [a] ([a] T<T>.(A<B>) -> R).foo() {}
fun <A, B> [a] (() -> Unit).foo()
[a] fun <A, B> [a] ((A, B) -> Unit).foo()