fn types() {
    let x: [Vec<_>] = [];
    let y: *mut [SomeType; konst_funk()] = expr();
    let z: (// #digits
            usize,
            // exp
            i16) = funk();
    let z: (usize /* #digits */, i16 /* exp */) = funk();
}

struct F {
    f: extern "C" fn(x: u8, ... /* comment */),
    g: extern "C" fn(x: u8,
                     // comment
                     ...),
    h: extern "C" fn(x: u8, ...),
    i: extern "C" fn(x: u8,
                     // comment 4
                     y: String, // comment 3
                     z: Foo,
                     // comment
                     ... /* comment 2 */),
}

fn issue_1006(def_id_to_string: for<'a, 'b> unsafe fn(TyCtxt<'b, 'tcx, 'tcx>, DefId) -> String) {}

fn impl_trait_fn_1() -> impl Fn(i32) -> Option<u8> {}

fn impl_trait_fn_2<E>() -> impl Future<Item = &'a i64, Error = E> {}

fn issue_1234() {
    do_parse!(name: take_while1!(is_token) >> (Header))
}