package foo:foo;

interface bar {
  foo: func(x: future<future<u32>>, y: u32) -> stream<string>;
}

world module {
  import bar;
  import foo: func(x: future<future<u32>>, y: u32) -> stream<string>;
  export bar;
  export foo: func(x: future<future<u32>>, y: u32) -> stream<string>;
}