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Diffstat (limited to 'third_party/rust/tokio/src/macros/select.rs')
| -rw-r--r-- | third_party/rust/tokio/src/macros/select.rs | 1001 |
1 files changed, 1001 insertions, 0 deletions
diff --git a/third_party/rust/tokio/src/macros/select.rs b/third_party/rust/tokio/src/macros/select.rs new file mode 100644 index 0000000000..051f8cb72a --- /dev/null +++ b/third_party/rust/tokio/src/macros/select.rs @@ -0,0 +1,1001 @@ +/// Waits on multiple concurrent branches, returning when the **first** branch +/// completes, cancelling the remaining branches. +/// +/// The `select!` macro must be used inside of async functions, closures, and +/// blocks. +/// +/// The `select!` macro accepts one or more branches with the following pattern: +/// +/// ```text +/// <pattern> = <async expression> (, if <precondition>)? => <handler>, +/// ``` +/// +/// Additionally, the `select!` macro may include a single, optional `else` +/// branch, which evaluates if none of the other branches match their patterns: +/// +/// ```text +/// else => <expression> +/// ``` +/// +/// The macro aggregates all `<async expression>` expressions and runs them +/// concurrently on the **current** task. Once the **first** expression +/// completes with a value that matches its `<pattern>`, the `select!` macro +/// returns the result of evaluating the completed branch's `<handler>` +/// expression. +/// +/// Additionally, each branch may include an optional `if` precondition. If the +/// precondition returns `false`, then the branch is disabled. The provided +/// `<async expression>` is still evaluated but the resulting future is never +/// polled. This capability is useful when using `select!` within a loop. +/// +/// The complete lifecycle of a `select!` expression is as follows: +/// +/// 1. Evaluate all provided `<precondition>` expressions. If the precondition +/// returns `false`, disable the branch for the remainder of the current call +/// to `select!`. Re-entering `select!` due to a loop clears the "disabled" +/// state. +/// 2. Aggregate the `<async expression>`s from each branch, including the +/// disabled ones. If the branch is disabled, `<async expression>` is still +/// evaluated, but the resulting future is not polled. +/// 3. Concurrently await on the results for all remaining `<async expression>`s. +/// 4. Once an `<async expression>` returns a value, attempt to apply the value +/// to the provided `<pattern>`, if the pattern matches, evaluate `<handler>` +/// and return. If the pattern **does not** match, disable the current branch +/// and for the remainder of the current call to `select!`. Continue from step 3. +/// 5. If **all** branches are disabled, evaluate the `else` expression. If no +/// else branch is provided, panic. +/// +/// # Runtime characteristics +/// +/// By running all async expressions on the current task, the expressions are +/// able to run **concurrently** but not in **parallel**. This means all +/// expressions are run on the same thread and if one branch blocks the thread, +/// all other expressions will be unable to continue. If parallelism is +/// required, spawn each async expression using [`tokio::spawn`] and pass the +/// join handle to `select!`. +/// +/// [`tokio::spawn`]: crate::spawn +/// +/// # Fairness +/// +/// By default, `select!` randomly picks a branch to check first. This provides +/// some level of fairness when calling `select!` in a loop with branches that +/// are always ready. +/// +/// This behavior can be overridden by adding `biased;` to the beginning of the +/// macro usage. See the examples for details. This will cause `select` to poll +/// the futures in the order they appear from top to bottom. There are a few +/// reasons you may want this: +/// +/// - The random number generation of `tokio::select!` has a non-zero CPU cost +/// - Your futures may interact in a way where known polling order is significant +/// +/// But there is an important caveat to this mode. It becomes your responsibility +/// to ensure that the polling order of your futures is fair. If for example you +/// are selecting between a stream and a shutdown future, and the stream has a +/// huge volume of messages and zero or nearly zero time between them, you should +/// place the shutdown future earlier in the `select!` list to ensure that it is +/// always polled, and will not be ignored due to the stream being constantly +/// ready. +/// +/// # Panics +/// +/// The `select!` macro panics if all branches are disabled **and** there is no +/// provided `else` branch. A branch is disabled when the provided `if` +/// precondition returns `false` **or** when the pattern does not match the +/// result of `<async expression>`. +/// +/// # Cancellation safety +/// +/// When using `select!` in a loop to receive messages from multiple sources, +/// you should make sure that the receive call is cancellation safe to avoid +/// losing messages. This section goes through various common methods and +/// describes whether they are cancel safe. The lists in this section are not +/// exhaustive. +/// +/// The following methods are cancellation safe: +/// +/// * [`tokio::sync::mpsc::Receiver::recv`](crate::sync::mpsc::Receiver::recv) +/// * [`tokio::sync::mpsc::UnboundedReceiver::recv`](crate::sync::mpsc::UnboundedReceiver::recv) +/// * [`tokio::sync::broadcast::Receiver::recv`](crate::sync::broadcast::Receiver::recv) +/// * [`tokio::sync::watch::Receiver::changed`](crate::sync::watch::Receiver::changed) +/// * [`tokio::net::TcpListener::accept`](crate::net::TcpListener::accept) +/// * [`tokio::net::UnixListener::accept`](crate::net::UnixListener::accept) +/// * [`tokio::io::AsyncReadExt::read`](crate::io::AsyncReadExt::read) on any `AsyncRead` +/// * [`tokio::io::AsyncReadExt::read_buf`](crate::io::AsyncReadExt::read_buf) on any `AsyncRead` +/// * [`tokio::io::AsyncWriteExt::write`](crate::io::AsyncWriteExt::write) on any `AsyncWrite` +/// * [`tokio::io::AsyncWriteExt::write_buf`](crate::io::AsyncWriteExt::write_buf) on any `AsyncWrite` +/// * [`tokio_stream::StreamExt::next`](https://docs.rs/tokio-stream/0.1/tokio_stream/trait.StreamExt.html#method.next) on any `Stream` +/// * [`futures::stream::StreamExt::next`](https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.next) on any `Stream` +/// +/// The following methods are not cancellation safe and can lead to loss of data: +/// +/// * [`tokio::io::AsyncReadExt::read_exact`](crate::io::AsyncReadExt::read_exact) +/// * [`tokio::io::AsyncReadExt::read_to_end`](crate::io::AsyncReadExt::read_to_end) +/// * [`tokio::io::AsyncReadExt::read_to_string`](crate::io::AsyncReadExt::read_to_string) +/// * [`tokio::io::AsyncWriteExt::write_all`](crate::io::AsyncWriteExt::write_all) +/// +/// The following methods are not cancellation safe because they use a queue for +/// fairness and cancellation makes you lose your place in the queue: +/// +/// * [`tokio::sync::Mutex::lock`](crate::sync::Mutex::lock) +/// * [`tokio::sync::RwLock::read`](crate::sync::RwLock::read) +/// * [`tokio::sync::RwLock::write`](crate::sync::RwLock::write) +/// * [`tokio::sync::Semaphore::acquire`](crate::sync::Semaphore::acquire) +/// * [`tokio::sync::Notify::notified`](crate::sync::Notify::notified) +/// +/// To determine whether your own methods are cancellation safe, look for the +/// location of uses of `.await`. This is because when an asynchronous method is +/// cancelled, that always happens at an `.await`. If your function behaves +/// correctly even if it is restarted while waiting at an `.await`, then it is +/// cancellation safe. +/// +/// Be aware that cancelling something that is not cancellation safe is not +/// necessarily wrong. For example, if you are cancelling a task because the +/// application is shutting down, then you probably don't care that partially +/// read data is lost. +/// +/// # Examples +/// +/// Basic select with two branches. +/// +/// ``` +/// async fn do_stuff_async() { +/// // async work +/// } +/// +/// async fn more_async_work() { +/// // more here +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// tokio::select! { +/// _ = do_stuff_async() => { +/// println!("do_stuff_async() completed first") +/// } +/// _ = more_async_work() => { +/// println!("more_async_work() completed first") +/// } +/// }; +/// } +/// ``` +/// +/// Basic stream selecting. +/// +/// ``` +/// use tokio_stream::{self as stream, StreamExt}; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut stream1 = stream::iter(vec![1, 2, 3]); +/// let mut stream2 = stream::iter(vec![4, 5, 6]); +/// +/// let next = tokio::select! { +/// v = stream1.next() => v.unwrap(), +/// v = stream2.next() => v.unwrap(), +/// }; +/// +/// assert!(next == 1 || next == 4); +/// } +/// ``` +/// +/// Collect the contents of two streams. In this example, we rely on pattern +/// matching and the fact that `stream::iter` is "fused", i.e. once the stream +/// is complete, all calls to `next()` return `None`. +/// +/// ``` +/// use tokio_stream::{self as stream, StreamExt}; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut stream1 = stream::iter(vec![1, 2, 3]); +/// let mut stream2 = stream::iter(vec![4, 5, 6]); +/// +/// let mut values = vec![]; +/// +/// loop { +/// tokio::select! { +/// Some(v) = stream1.next() => values.push(v), +/// Some(v) = stream2.next() => values.push(v), +/// else => break, +/// } +/// } +/// +/// values.sort(); +/// assert_eq!(&[1, 2, 3, 4, 5, 6], &values[..]); +/// } +/// ``` +/// +/// Using the same future in multiple `select!` expressions can be done by passing +/// a reference to the future. Doing so requires the future to be [`Unpin`]. A +/// future can be made [`Unpin`] by either using [`Box::pin`] or stack pinning. +/// +/// [`Unpin`]: std::marker::Unpin +/// [`Box::pin`]: std::boxed::Box::pin +/// +/// Here, a stream is consumed for at most 1 second. +/// +/// ``` +/// use tokio_stream::{self as stream, StreamExt}; +/// use tokio::time::{self, Duration}; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut stream = stream::iter(vec![1, 2, 3]); +/// let sleep = time::sleep(Duration::from_secs(1)); +/// tokio::pin!(sleep); +/// +/// loop { +/// tokio::select! { +/// maybe_v = stream.next() => { +/// if let Some(v) = maybe_v { +/// println!("got = {}", v); +/// } else { +/// break; +/// } +/// } +/// _ = &mut sleep => { +/// println!("timeout"); +/// break; +/// } +/// } +/// } +/// } +/// ``` +/// +/// Joining two values using `select!`. +/// +/// ``` +/// use tokio::sync::oneshot; +/// +/// #[tokio::main] +/// async fn main() { +/// let (tx1, mut rx1) = oneshot::channel(); +/// let (tx2, mut rx2) = oneshot::channel(); +/// +/// tokio::spawn(async move { +/// tx1.send("first").unwrap(); +/// }); +/// +/// tokio::spawn(async move { +/// tx2.send("second").unwrap(); +/// }); +/// +/// let mut a = None; +/// let mut b = None; +/// +/// while a.is_none() || b.is_none() { +/// tokio::select! { +/// v1 = (&mut rx1), if a.is_none() => a = Some(v1.unwrap()), +/// v2 = (&mut rx2), if b.is_none() => b = Some(v2.unwrap()), +/// } +/// } +/// +/// let res = (a.unwrap(), b.unwrap()); +/// +/// assert_eq!(res.0, "first"); +/// assert_eq!(res.1, "second"); +/// } +/// ``` +/// +/// Using the `biased;` mode to control polling order. +/// +/// ``` +/// #[tokio::main] +/// async fn main() { +/// let mut count = 0u8; +/// +/// loop { +/// tokio::select! { +/// // If you run this example without `biased;`, the polling order is +/// // pseudo-random, and the assertions on the value of count will +/// // (probably) fail. +/// biased; +/// +/// _ = async {}, if count < 1 => { +/// count += 1; +/// assert_eq!(count, 1); +/// } +/// _ = async {}, if count < 2 => { +/// count += 1; +/// assert_eq!(count, 2); +/// } +/// _ = async {}, if count < 3 => { +/// count += 1; +/// assert_eq!(count, 3); +/// } +/// _ = async {}, if count < 4 => { +/// count += 1; +/// assert_eq!(count, 4); +/// } +/// +/// else => { +/// break; +/// } +/// }; +/// } +/// } +/// ``` +/// +/// ## Avoid racy `if` preconditions +/// +/// Given that `if` preconditions are used to disable `select!` branches, some +/// caution must be used to avoid missing values. +/// +/// For example, here is **incorrect** usage of `sleep` with `if`. The objective +/// is to repeatedly run an asynchronous task for up to 50 milliseconds. +/// However, there is a potential for the `sleep` completion to be missed. +/// +/// ```no_run,should_panic +/// use tokio::time::{self, Duration}; +/// +/// async fn some_async_work() { +/// // do work +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let sleep = time::sleep(Duration::from_millis(50)); +/// tokio::pin!(sleep); +/// +/// while !sleep.is_elapsed() { +/// tokio::select! { +/// _ = &mut sleep, if !sleep.is_elapsed() => { +/// println!("operation timed out"); +/// } +/// _ = some_async_work() => { +/// println!("operation completed"); +/// } +/// } +/// } +/// +/// panic!("This example shows how not to do it!"); +/// } +/// ``` +/// +/// In the above example, `sleep.is_elapsed()` may return `true` even if +/// `sleep.poll()` never returned `Ready`. This opens up a potential race +/// condition where `sleep` expires between the `while !sleep.is_elapsed()` +/// check and the call to `select!` resulting in the `some_async_work()` call to +/// run uninterrupted despite the sleep having elapsed. +/// +/// One way to write the above example without the race would be: +/// +/// ``` +/// use tokio::time::{self, Duration}; +/// +/// async fn some_async_work() { +/// # time::sleep(Duration::from_millis(10)).await; +/// // do work +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let sleep = time::sleep(Duration::from_millis(50)); +/// tokio::pin!(sleep); +/// +/// loop { +/// tokio::select! { +/// _ = &mut sleep => { +/// println!("operation timed out"); +/// break; +/// } +/// _ = some_async_work() => { +/// println!("operation completed"); +/// } +/// } +/// } +/// } +/// ``` +#[macro_export] +#[cfg_attr(docsrs, doc(cfg(feature = "macros")))] +macro_rules! select { + // Uses a declarative macro to do **most** of the work. While it is possible + // to implement fully with a declarative macro, a procedural macro is used + // to enable improved error messages. + // + // The macro is structured as a tt-muncher. All branches are processed and + // normalized. Once the input is normalized, it is passed to the top-most + // rule. When entering the macro, `@{ }` is inserted at the front. This is + // used to collect the normalized input. + // + // The macro only recurses once per branch. This allows using `select!` + // without requiring the user to increase the recursion limit. + + // All input is normalized, now transform. + (@ { + // The index of the future to poll first (in bias mode), or the RNG + // expression to use to pick a future to poll first. + start=$start:expr; + + // One `_` for each branch in the `select!` macro. Passing this to + // `count!` converts $skip to an integer. + ( $($count:tt)* ) + + // Normalized select branches. `( $skip )` is a set of `_` characters. + // There is one `_` for each select branch **before** this one. Given + // that all input futures are stored in a tuple, $skip is useful for + // generating a pattern to reference the future for the current branch. + // $skip is also used as an argument to `count!`, returning the index of + // the current select branch. + $( ( $($skip:tt)* ) $bind:pat = $fut:expr, if $c:expr => $handle:expr, )+ + + // Fallback expression used when all select branches have been disabled. + ; $else:expr + + }) => {{ + // Enter a context where stable "function-like" proc macros can be used. + // + // This module is defined within a scope and should not leak out of this + // macro. + mod util { + // Generate an enum with one variant per select branch + $crate::select_priv_declare_output_enum!( ( $($count)* ) ); + } + + // `tokio::macros::support` is a public, but doc(hidden) module + // including a re-export of all types needed by this macro. + use $crate::macros::support::Future; + use $crate::macros::support::Pin; + use $crate::macros::support::Poll::{Ready, Pending}; + + const BRANCHES: u32 = $crate::count!( $($count)* ); + + let mut disabled: util::Mask = Default::default(); + + // First, invoke all the pre-conditions. For any that return true, + // set the appropriate bit in `disabled`. + $( + if !$c { + let mask: util::Mask = 1 << $crate::count!( $($skip)* ); + disabled |= mask; + } + )* + + // Create a scope to separate polling from handling the output. This + // adds borrow checker flexibility when using the macro. + let mut output = { + // Safety: Nothing must be moved out of `futures`. This is to + // satisfy the requirement of `Pin::new_unchecked` called below. + let mut futures = ( $( $fut , )+ ); + + $crate::macros::support::poll_fn(|cx| { + // Track if any branch returns pending. If no branch completes + // **or** returns pending, this implies that all branches are + // disabled. + let mut is_pending = false; + + // Choose a starting index to begin polling the futures at. In + // practice, this will either be a pseudo-randomly generated + // number by default, or the constant 0 if `biased;` is + // supplied. + let start = $start; + + for i in 0..BRANCHES { + let branch; + #[allow(clippy::modulo_one)] + { + branch = (start + i) % BRANCHES; + } + match branch { + $( + #[allow(unreachable_code)] + $crate::count!( $($skip)* ) => { + // First, if the future has previously been + // disabled, do not poll it again. This is done + // by checking the associated bit in the + // `disabled` bit field. + let mask = 1 << branch; + + if disabled & mask == mask { + // The future has been disabled. + continue; + } + + // Extract the future for this branch from the + // tuple + let ( $($skip,)* fut, .. ) = &mut futures; + + // Safety: future is stored on the stack above + // and never moved. + let mut fut = unsafe { Pin::new_unchecked(fut) }; + + // Try polling it + let out = match Future::poll(fut, cx) { + Ready(out) => out, + Pending => { + // Track that at least one future is + // still pending and continue polling. + is_pending = true; + continue; + } + }; + + // Disable the future from future polling. + disabled |= mask; + + // The future returned a value, check if matches + // the specified pattern. + #[allow(unused_variables)] + #[allow(unused_mut)] + match &out { + $crate::select_priv_clean_pattern!($bind) => {} + _ => continue, + } + + // The select is complete, return the value + return Ready($crate::select_variant!(util::Out, ($($skip)*))(out)); + } + )* + _ => unreachable!("reaching this means there probably is an off by one bug"), + } + } + + if is_pending { + Pending + } else { + // All branches have been disabled. + Ready(util::Out::Disabled) + } + }).await + }; + + match output { + $( + $crate::select_variant!(util::Out, ($($skip)*) ($bind)) => $handle, + )* + util::Out::Disabled => $else, + _ => unreachable!("failed to match bind"), + } + }}; + + // ==== Normalize ===== + + // These rules match a single `select!` branch and normalize it for + // processing by the first rule. + + (@ { start=$start:expr; $($t:tt)* } ) => { + // No `else` branch + $crate::select!(@{ start=$start; $($t)*; panic!("all branches are disabled and there is no else branch") }) + }; + (@ { start=$start:expr; $($t:tt)* } else => $else:expr $(,)?) => { + $crate::select!(@{ start=$start; $($t)*; $else }) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr, if $c:expr => $h:block, $($r:tt)* ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if $c => $h, } $($r)*) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr => $h:block, $($r:tt)* ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if true => $h, } $($r)*) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr, if $c:expr => $h:block $($r:tt)* ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if $c => $h, } $($r)*) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr => $h:block $($r:tt)* ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if true => $h, } $($r)*) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr, if $c:expr => $h:expr ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if $c => $h, }) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr => $h:expr ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if true => $h, }) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr, if $c:expr => $h:expr, $($r:tt)* ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if $c => $h, } $($r)*) + }; + (@ { start=$start:expr; ( $($s:tt)* ) $($t:tt)* } $p:pat = $f:expr => $h:expr, $($r:tt)* ) => { + $crate::select!(@{ start=$start; ($($s)* _) $($t)* ($($s)*) $p = $f, if true => $h, } $($r)*) + }; + + // ===== Entry point ===== + + (biased; $p:pat = $($t:tt)* ) => { + $crate::select!(@{ start=0; () } $p = $($t)*) + }; + + ( $p:pat = $($t:tt)* ) => { + // Randomly generate a starting point. This makes `select!` a bit more + // fair and avoids always polling the first future. + $crate::select!(@{ start={ $crate::macros::support::thread_rng_n(BRANCHES) }; () } $p = $($t)*) + }; + () => { + compile_error!("select! requires at least one branch.") + }; +} + +// And here... we manually list out matches for up to 64 branches... I'm not +// happy about it either, but this is how we manage to use a declarative macro! + +#[macro_export] +#[doc(hidden)] +macro_rules! count { + () => { + 0 + }; + (_) => { + 1 + }; + (_ _) => { + 2 + }; + (_ _ _) => { + 3 + }; + (_ _ _ _) => { + 4 + }; + (_ _ _ _ _) => { + 5 + }; + (_ _ _ _ _ _) => { + 6 + }; + (_ _ _ _ _ _ _) => { + 7 + }; + (_ _ _ _ _ _ _ _) => { + 8 + }; + (_ _ _ _ _ _ _ _ _) => { + 9 + }; + (_ _ _ _ _ _ _ _ _ _) => { + 10 + }; + (_ _ _ _ _ _ _ _ _ _ _) => { + 11 + }; + (_ _ _ _ _ _ _ _ _ _ _ _) => { + 12 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _) => { + 13 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 14 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 15 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 16 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 17 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 18 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 19 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 20 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 21 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 22 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 23 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 24 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 25 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 26 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 27 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 28 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 29 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 30 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 31 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 32 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 33 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 34 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 35 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 36 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 37 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 38 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 39 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 40 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 41 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 42 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 43 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 44 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 45 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 46 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 47 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 48 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 49 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 50 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 51 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 52 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 53 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 54 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 55 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 56 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 57 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 58 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 59 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 60 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 61 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 62 + }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 63 + }; +} + +#[macro_export] +#[doc(hidden)] +macro_rules! select_variant { + ($($p:ident)::*, () $($t:tt)*) => { + $($p)::*::_0 $($t)* + }; + ($($p:ident)::*, (_) $($t:tt)*) => { + $($p)::*::_1 $($t)* + }; + ($($p:ident)::*, (_ _) $($t:tt)*) => { + $($p)::*::_2 $($t)* + }; + ($($p:ident)::*, (_ _ _) $($t:tt)*) => { + $($p)::*::_3 $($t)* + }; + ($($p:ident)::*, (_ _ _ _) $($t:tt)*) => { + $($p)::*::_4 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _) $($t:tt)*) => { + $($p)::*::_5 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_6 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_7 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_8 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_9 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_10 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_11 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_12 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_13 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_14 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_15 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_16 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_17 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_18 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_19 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_20 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_21 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_22 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_23 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_24 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_25 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_26 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_27 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_28 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_29 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_30 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_31 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_32 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_33 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_34 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_35 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_36 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_37 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_38 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_39 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_40 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_41 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_42 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_43 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_44 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_45 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_46 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_47 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_48 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_49 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_50 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_51 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_52 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_53 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_54 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_55 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_56 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_57 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_58 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_59 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_60 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_61 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_62 $($t)* + }; + ($($p:ident)::*, (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) $($t:tt)*) => { + $($p)::*::_63 $($t)* + }; +} |