rustfmt-nightly 1.4.21

// rustfmt-normalize_comments: true
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))
}

// #2510
impl CombineTypes {
    pub fn pop_callback(
        &self,
        query_id: Uuid,
    ) -> Option<(
        ProjectId,
        Box<FnMut(&ProjectState, serde_json::Value, bool) -> () + Sync + Send>,
    )> {
        self.query_callbacks()(&query_id)
    }
}

// #2859
pub fn do_something<'a, T: Trait1 + Trait2 + 'a>(
    &fooo: u32,
) -> impl Future<
    Item = (
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
    ),
    Error = SomeError,
> + 'a {
}

pub fn do_something<'a, T: Trait1 + Trait2 + 'a>(
    &fooo: u32,
) -> impl Future<
    Item = (
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
    ),
    Error = SomeError,
> + Future<
    Item = (
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
    ),
    Error = SomeError,
> + Future<
    Item = (
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
        impl Future<Item = (), Error = SomeError> + 'a,
    ),
    Error = SomeError,
> + 'a + 'b + 'c {
}

// #3051
token![impl];
token![impl];

// #3060
macro_rules! foo {
    ($foo_api: ty) => {
        type Target = ($foo_api) + 'static;
    };
}

type Target = (FooAPI) + 'static;

// #3137
fn foo<T>(t: T)
where
    T: (FnOnce() -> ()) + Clone,
    U: (FnOnce() -> ()) + 'static,
{
}

// #3117
fn issue3117() {
    {
        {
            {
                {
                    {
                        {
                            {
                                {
                                    let opt: &mut Option<MyLongTypeHere> =
                                        unsafe { &mut *self.future.get() };
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

// #3139
fn issue3139() {
    assert_eq!(
        to_json_value(&None::<i32>).unwrap(),
        json!({ "test": None::<i32> })
    );
}

// #3180
fn foo(
    a: SomeLongComplexType,
    b: SomeOtherLongComplexType,
) -> Box<Future<Item = AnotherLongType, Error = ALongErrorType>> {
}

type MyFn = fn(
    a: SomeLongComplexType,
    b: SomeOtherLongComplexType,
) -> Box<Future<Item = AnotherLongType, Error = ALongErrorType>>;

// Const opt-out

trait T: ?const Super {}

const fn maybe_const<S: ?const T>() -> i32 {
    <S as T>::CONST
}

struct S<T: ?const ?Sized>(std::marker::PhantomData<T>);

impl ?const T {}

fn trait_object() -> &'static dyn ?const T {
    &S
}

fn i(_: impl IntoIterator<Item = Box<dyn ?const T>>) {}

fn apit(_: impl ?const T) {}

fn rpit() -> impl ?const T {
    S
}

pub struct Foo<T: Trait>(T);
impl<T: ?const Trait> Foo<T> {
    fn new(t: T) -> Self {
        // not calling methods on `t`, so we opt out of requiring
        // `<T as Trait>` to have const methods via `?const`
        Self(t)
    }
}