Deleted vendor folder

1 files changed, 0 insertions, 1108 deletions

diff --git a/vendor/syn/src/punctuated.rs b/vendor/syn/src/punctuated.rs
deleted file mode 100644
index 3ea8a1d..0000000
--- a/vendor/syn/src/punctuated.rs
+++ /dev/null
@@ -1,1108 +0,0 @@
-//! A punctuated sequence of syntax tree nodes separated by punctuation.
-//!
-//! Lots of things in Rust are punctuated sequences.
-//!
-//! - The fields of a struct are `Punctuated<Field, Token![,]>`.
-//! - The segments of a path are `Punctuated<PathSegment, Token![::]>`.
-//! - The bounds on a generic parameter are `Punctuated<TypeParamBound,
-//!   Token![+]>`.
-//! - The arguments to a function call are `Punctuated<Expr, Token![,]>`.
-//!
-//! This module provides a common representation for these punctuated sequences
-//! in the form of the [`Punctuated<T, P>`] type. We store a vector of pairs of
-//! syntax tree node + punctuation, where every node in the sequence is followed
-//! by punctuation except for possibly the final one.
-//!
-//! [`Punctuated<T, P>`]: Punctuated
-//!
-//! ```text
-//! a_function_call(arg1, arg2, arg3);
-//!                 ~~~~^ ~~~~^ ~~~~
-//! ```
-
-#[cfg(feature = "extra-traits")]
-use std::fmt::{self, Debug};
-#[cfg(feature = "extra-traits")]
-use std::hash::{Hash, Hasher};
-#[cfg(any(feature = "full", feature = "derive"))]
-use std::iter;
-use std::ops::{Index, IndexMut};
-use std::option;
-use std::slice;
-use std::vec;
-
-use crate::drops::{NoDrop, TrivialDrop};
-#[cfg(feature = "parsing")]
-use crate::parse::{Parse, ParseStream, Result};
-#[cfg(feature = "parsing")]
-use crate::token::Token;
-
-/// **A punctuated sequence of syntax tree nodes of type `T` separated by
-/// punctuation of type `P`.**
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct Punctuated<T, P> {
-    inner: Vec<(T, P)>,
-    last: Option<Box<T>>,
-}
-
-impl<T, P> Punctuated<T, P> {
-    /// Creates an empty punctuated sequence.
-    pub const fn new() -> Self {
-        Punctuated {
-            inner: Vec::new(),
-            last: None,
-        }
-    }
-
-    /// Determines whether this punctuated sequence is empty, meaning it
-    /// contains no syntax tree nodes or punctuation.
-    pub fn is_empty(&self) -> bool {
-        self.inner.len() == 0 && self.last.is_none()
-    }
-
-    /// Returns the number of syntax tree nodes in this punctuated sequence.
-    ///
-    /// This is the number of nodes of type `T`, not counting the punctuation of
-    /// type `P`.
-    pub fn len(&self) -> usize {
-        self.inner.len() + if self.last.is_some() { 1 } else { 0 }
-    }
-
-    /// Borrows the first element in this sequence.
-    pub fn first(&self) -> Option<&T> {
-        self.iter().next()
-    }
-
-    /// Mutably borrows the first element in this sequence.
-    pub fn first_mut(&mut self) -> Option<&mut T> {
-        self.iter_mut().next()
-    }
-
-    /// Borrows the last element in this sequence.
-    pub fn last(&self) -> Option<&T> {
-        self.iter().next_back()
-    }
-
-    /// Mutably borrows the last element in this sequence.
-    pub fn last_mut(&mut self) -> Option<&mut T> {
-        self.iter_mut().next_back()
-    }
-
-    /// Returns an iterator over borrowed syntax tree nodes of type `&T`.
-    pub fn iter(&self) -> Iter<T> {
-        Iter {
-            inner: Box::new(NoDrop::new(PrivateIter {
-                inner: self.inner.iter(),
-                last: self.last.as_ref().map(Box::as_ref).into_iter(),
-            })),
-        }
-    }
-
-    /// Returns an iterator over mutably borrowed syntax tree nodes of type
-    /// `&mut T`.
-    pub fn iter_mut(&mut self) -> IterMut<T> {
-        IterMut {
-            inner: Box::new(NoDrop::new(PrivateIterMut {
-                inner: self.inner.iter_mut(),
-                last: self.last.as_mut().map(Box::as_mut).into_iter(),
-            })),
-        }
-    }
-
-    /// Returns an iterator over the contents of this sequence as borrowed
-    /// punctuated pairs.
-    pub fn pairs(&self) -> Pairs<T, P> {
-        Pairs {
-            inner: self.inner.iter(),
-            last: self.last.as_ref().map(Box::as_ref).into_iter(),
-        }
-    }
-
-    /// Returns an iterator over the contents of this sequence as mutably
-    /// borrowed punctuated pairs.
-    pub fn pairs_mut(&mut self) -> PairsMut<T, P> {
-        PairsMut {
-            inner: self.inner.iter_mut(),
-            last: self.last.as_mut().map(Box::as_mut).into_iter(),
-        }
-    }
-
-    /// Returns an iterator over the contents of this sequence as owned
-    /// punctuated pairs.
-    pub fn into_pairs(self) -> IntoPairs<T, P> {
-        IntoPairs {
-            inner: self.inner.into_iter(),
-            last: self.last.map(|t| *t).into_iter(),
-        }
-    }
-
-    /// Appends a syntax tree node onto the end of this punctuated sequence. The
-    /// sequence must already have a trailing punctuation, or be empty.
-    ///
-    /// Use [`push`] instead if the punctuated sequence may or may not already
-    /// have trailing punctuation.
-    ///
-    /// [`push`]: Punctuated::push
-    ///
-    /// # Panics
-    ///
-    /// Panics if the sequence is nonempty and does not already have a trailing
-    /// punctuation.
-    pub fn push_value(&mut self, value: T) {
-        assert!(
-            self.empty_or_trailing(),
-            "Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation",
-        );
-
-        self.last = Some(Box::new(value));
-    }
-
-    /// Appends a trailing punctuation onto the end of this punctuated sequence.
-    /// The sequence must be non-empty and must not already have trailing
-    /// punctuation.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the sequence is empty or already has a trailing punctuation.
-    pub fn push_punct(&mut self, punctuation: P) {
-        assert!(
-            self.last.is_some(),
-            "Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation",
-        );
-
-        let last = self.last.take().unwrap();
-        self.inner.push((*last, punctuation));
-    }
-
-    /// Removes the last punctuated pair from this sequence, or `None` if the
-    /// sequence is empty.
-    pub fn pop(&mut self) -> Option<Pair<T, P>> {
-        if self.last.is_some() {
-            self.last.take().map(|t| Pair::End(*t))
-        } else {
-            self.inner.pop().map(|(t, p)| Pair::Punctuated(t, p))
-        }
-    }
-
-    /// Removes the trailing punctuation from this punctuated sequence, or
-    /// `None` if there isn't any.
-    pub fn pop_punct(&mut self) -> Option<P> {
-        if self.last.is_some() {
-            None
-        } else {
-            let (t, p) = self.inner.pop()?;
-            self.last = Some(Box::new(t));
-            Some(p)
-        }
-    }
-
-    /// Determines whether this punctuated sequence ends with a trailing
-    /// punctuation.
-    pub fn trailing_punct(&self) -> bool {
-        self.last.is_none() && !self.is_empty()
-    }
-
-    /// Returns true if either this `Punctuated` is empty, or it has a trailing
-    /// punctuation.
-    ///
-    /// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`.
-    pub fn empty_or_trailing(&self) -> bool {
-        self.last.is_none()
-    }
-
-    /// Appends a syntax tree node onto the end of this punctuated sequence.
-    ///
-    /// If there is not a trailing punctuation in this sequence when this method
-    /// is called, the default value of punctuation type `P` is inserted before
-    /// the given value of type `T`.
-    pub fn push(&mut self, value: T)
-    where
-        P: Default,
-    {
-        if !self.empty_or_trailing() {
-            self.push_punct(Default::default());
-        }
-        self.push_value(value);
-    }
-
-    /// Inserts an element at position `index`.
-    ///
-    /// # Panics
-    ///
-    /// Panics if `index` is greater than the number of elements previously in
-    /// this punctuated sequence.
-    pub fn insert(&mut self, index: usize, value: T)
-    where
-        P: Default,
-    {
-        assert!(
-            index <= self.len(),
-            "Punctuated::insert: index out of range",
-        );
-
-        if index == self.len() {
-            self.push(value);
-        } else {
-            self.inner.insert(index, (value, Default::default()));
-        }
-    }
-
-    /// Clears the sequence of all values and punctuation, making it empty.
-    pub fn clear(&mut self) {
-        self.inner.clear();
-        self.last = None;
-    }
-
-    /// Parses zero or more occurrences of `T` separated by punctuation of type
-    /// `P`, with optional trailing punctuation.
-    ///
-    /// Parsing continues until the end of this parse stream. The entire content
-    /// of this parse stream must consist of `T` and `P`.
-    #[cfg(feature = "parsing")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    pub fn parse_terminated(input: ParseStream) -> Result<Self>
-    where
-        T: Parse,
-        P: Parse,
-    {
-        Self::parse_terminated_with(input, T::parse)
-    }
-
-    /// Parses zero or more occurrences of `T` using the given parse function,
-    /// separated by punctuation of type `P`, with optional trailing
-    /// punctuation.
-    ///
-    /// Like [`parse_terminated`], the entire content of this stream is expected
-    /// to be parsed.
-    ///
-    /// [`parse_terminated`]: Punctuated::parse_terminated
-    #[cfg(feature = "parsing")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    pub fn parse_terminated_with(
-        input: ParseStream,
-        parser: fn(ParseStream) -> Result<T>,
-    ) -> Result<Self>
-    where
-        P: Parse,
-    {
-        let mut punctuated = Punctuated::new();
-
-        loop {
-            if input.is_empty() {
-                break;
-            }
-            let value = parser(input)?;
-            punctuated.push_value(value);
-            if input.is_empty() {
-                break;
-            }
-            let punct = input.parse()?;
-            punctuated.push_punct(punct);
-        }
-
-        Ok(punctuated)
-    }
-
-    /// Parses one or more occurrences of `T` separated by punctuation of type
-    /// `P`, not accepting trailing punctuation.
-    ///
-    /// Parsing continues as long as punctuation `P` is present at the head of
-    /// the stream. This method returns upon parsing a `T` and observing that it
-    /// is not followed by a `P`, even if there are remaining tokens in the
-    /// stream.
-    #[cfg(feature = "parsing")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
-    where
-        T: Parse,
-        P: Token + Parse,
-    {
-        Self::parse_separated_nonempty_with(input, T::parse)
-    }
-
-    /// Parses one or more occurrences of `T` using the given parse function,
-    /// separated by punctuation of type `P`, not accepting trailing
-    /// punctuation.
-    ///
-    /// Like [`parse_separated_nonempty`], may complete early without parsing
-    /// the entire content of this stream.
-    ///
-    /// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
-    #[cfg(feature = "parsing")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    pub fn parse_separated_nonempty_with(
-        input: ParseStream,
-        parser: fn(ParseStream) -> Result<T>,
-    ) -> Result<Self>
-    where
-        P: Token + Parse,
-    {
-        let mut punctuated = Punctuated::new();
-
-        loop {
-            let value = parser(input)?;
-            punctuated.push_value(value);
-            if !P::peek(input.cursor()) {
-                break;
-            }
-            let punct = input.parse()?;
-            punctuated.push_punct(punct);
-        }
-
-        Ok(punctuated)
-    }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Clone for Punctuated<T, P>
-where
-    T: Clone,
-    P: Clone,
-{
-    fn clone(&self) -> Self {
-        Punctuated {
-            inner: self.inner.clone(),
-            last: self.last.clone(),
-        }
-    }
-
-    fn clone_from(&mut self, other: &Self) {
-        self.inner.clone_from(&other.inner);
-        self.last.clone_from(&other.last);
-    }
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T, P> Eq for Punctuated<T, P>
-where
-    T: Eq,
-    P: Eq,
-{
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T, P> PartialEq for Punctuated<T, P>
-where
-    T: PartialEq,
-    P: PartialEq,
-{
-    fn eq(&self, other: &Self) -> bool {
-        let Punctuated { inner, last } = self;
-        *inner == other.inner && *last == other.last
-    }
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T, P> Hash for Punctuated<T, P>
-where
-    T: Hash,
-    P: Hash,
-{
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        let Punctuated { inner, last } = self;
-        inner.hash(state);
-        last.hash(state);
-    }
-}
-
-#[cfg(feature = "extra-traits")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
-impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let mut list = f.debug_list();
-        for (t, p) in &self.inner {
-            list.entry(t);
-            list.entry(p);
-        }
-        if let Some(last) = &self.last {
-            list.entry(last);
-        }
-        list.finish()
-    }
-}
-
-impl<T, P> FromIterator<T> for Punctuated<T, P>
-where
-    P: Default,
-{
-    fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
-        let mut ret = Punctuated::new();
-        ret.extend(i);
-        ret
-    }
-}
-
-impl<T, P> Extend<T> for Punctuated<T, P>
-where
-    P: Default,
-{
-    fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
-        for value in i {
-            self.push(value);
-        }
-    }
-}
-
-impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
-    fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
-        let mut ret = Punctuated::new();
-        do_extend(&mut ret, i.into_iter());
-        ret
-    }
-}
-
-impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P>
-where
-    P: Default,
-{
-    fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
-        if !self.empty_or_trailing() {
-            self.push_punct(P::default());
-        }
-        do_extend(self, i.into_iter());
-    }
-}
-
-fn do_extend<T, P, I>(punctuated: &mut Punctuated<T, P>, i: I)
-where
-    I: Iterator<Item = Pair<T, P>>,
-{
-    let mut nomore = false;
-    for pair in i {
-        if nomore {
-            panic!("Punctuated extended with items after a Pair::End");
-        }
-        match pair {
-            Pair::Punctuated(a, b) => punctuated.inner.push((a, b)),
-            Pair::End(a) => {
-                punctuated.last = Some(Box::new(a));
-                nomore = true;
-            }
-        }
-    }
-}
-
-impl<T, P> IntoIterator for Punctuated<T, P> {
-    type Item = T;
-    type IntoIter = IntoIter<T>;
-
-    fn into_iter(self) -> Self::IntoIter {
-        let mut elements = Vec::with_capacity(self.len());
-        elements.extend(self.inner.into_iter().map(|pair| pair.0));
-        elements.extend(self.last.map(|t| *t));
-
-        IntoIter {
-            inner: elements.into_iter(),
-        }
-    }
-}
-
-impl<'a, T, P> IntoIterator for &'a Punctuated<T, P> {
-    type Item = &'a T;
-    type IntoIter = Iter<'a, T>;
-
-    fn into_iter(self) -> Self::IntoIter {
-        Punctuated::iter(self)
-    }
-}
-
-impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P> {
-    type Item = &'a mut T;
-    type IntoIter = IterMut<'a, T>;
-
-    fn into_iter(self) -> Self::IntoIter {
-        Punctuated::iter_mut(self)
-    }
-}
-
-impl<T, P> Default for Punctuated<T, P> {
-    fn default() -> Self {
-        Punctuated::new()
-    }
-}
-
-/// An iterator over borrowed pairs of type `Pair<&T, &P>`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct Pairs<'a, T: 'a, P: 'a> {
-    inner: slice::Iter<'a, (T, P)>,
-    last: option::IntoIter<&'a T>,
-}
-
-impl<'a, T, P> Iterator for Pairs<'a, T, P> {
-    type Item = Pair<&'a T, &'a P>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner
-            .next()
-            .map(|(t, p)| Pair::Punctuated(t, p))
-            .or_else(|| self.last.next().map(Pair::End))
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.len(), Some(self.len()))
-    }
-}
-
-impl<'a, T, P> DoubleEndedIterator for Pairs<'a, T, P> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.last
-            .next()
-            .map(Pair::End)
-            .or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
-    }
-}
-
-impl<'a, T, P> ExactSizeIterator for Pairs<'a, T, P> {
-    fn len(&self) -> usize {
-        self.inner.len() + self.last.len()
-    }
-}
-
-// No Clone bound on T or P.
-impl<'a, T, P> Clone for Pairs<'a, T, P> {
-    fn clone(&self) -> Self {
-        Pairs {
-            inner: self.inner.clone(),
-            last: self.last.clone(),
-        }
-    }
-}
-
-/// An iterator over mutably borrowed pairs of type `Pair<&mut T, &mut P>`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct PairsMut<'a, T: 'a, P: 'a> {
-    inner: slice::IterMut<'a, (T, P)>,
-    last: option::IntoIter<&'a mut T>,
-}
-
-impl<'a, T, P> Iterator for PairsMut<'a, T, P> {
-    type Item = Pair<&'a mut T, &'a mut P>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner
-            .next()
-            .map(|(t, p)| Pair::Punctuated(t, p))
-            .or_else(|| self.last.next().map(Pair::End))
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.len(), Some(self.len()))
-    }
-}
-
-impl<'a, T, P> DoubleEndedIterator for PairsMut<'a, T, P> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.last
-            .next()
-            .map(Pair::End)
-            .or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
-    }
-}
-
-impl<'a, T, P> ExactSizeIterator for PairsMut<'a, T, P> {
-    fn len(&self) -> usize {
-        self.inner.len() + self.last.len()
-    }
-}
-
-/// An iterator over owned pairs of type `Pair<T, P>`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct IntoPairs<T, P> {
-    inner: vec::IntoIter<(T, P)>,
-    last: option::IntoIter<T>,
-}
-
-impl<T, P> Iterator for IntoPairs<T, P> {
-    type Item = Pair<T, P>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner
-            .next()
-            .map(|(t, p)| Pair::Punctuated(t, p))
-            .or_else(|| self.last.next().map(Pair::End))
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.len(), Some(self.len()))
-    }
-}
-
-impl<T, P> DoubleEndedIterator for IntoPairs<T, P> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.last
-            .next()
-            .map(Pair::End)
-            .or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
-    }
-}
-
-impl<T, P> ExactSizeIterator for IntoPairs<T, P> {
-    fn len(&self) -> usize {
-        self.inner.len() + self.last.len()
-    }
-}
-
-impl<T, P> Clone for IntoPairs<T, P>
-where
-    T: Clone,
-    P: Clone,
-{
-    fn clone(&self) -> Self {
-        IntoPairs {
-            inner: self.inner.clone(),
-            last: self.last.clone(),
-        }
-    }
-}
-
-/// An iterator over owned values of type `T`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct IntoIter<T> {
-    inner: vec::IntoIter<T>,
-}
-
-impl<T> Iterator for IntoIter<T> {
-    type Item = T;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner.next()
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.len(), Some(self.len()))
-    }
-}
-
-impl<T> DoubleEndedIterator for IntoIter<T> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.inner.next_back()
-    }
-}
-
-impl<T> ExactSizeIterator for IntoIter<T> {
-    fn len(&self) -> usize {
-        self.inner.len()
-    }
-}
-
-impl<T> Clone for IntoIter<T>
-where
-    T: Clone,
-{
-    fn clone(&self) -> Self {
-        IntoIter {
-            inner: self.inner.clone(),
-        }
-    }
-}
-
-/// An iterator over borrowed values of type `&T`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct Iter<'a, T: 'a> {
-    inner: Box<NoDrop<dyn IterTrait<'a, T> + 'a>>,
-}
-
-trait IterTrait<'a, T: 'a>: Iterator<Item = &'a T> + DoubleEndedIterator + ExactSizeIterator {
-    fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T> + 'a>>;
-}
-
-struct PrivateIter<'a, T: 'a, P: 'a> {
-    inner: slice::Iter<'a, (T, P)>,
-    last: option::IntoIter<&'a T>,
-}
-
-impl<'a, T, P> TrivialDrop for PrivateIter<'a, T, P>
-where
-    slice::Iter<'a, (T, P)>: TrivialDrop,
-    option::IntoIter<&'a T>: TrivialDrop,
-{
-}
-
-#[cfg(any(feature = "full", feature = "derive"))]
-pub(crate) fn empty_punctuated_iter<'a, T>() -> Iter<'a, T> {
-    Iter {
-        inner: Box::new(NoDrop::new(iter::empty())),
-    }
-}
-
-// No Clone bound on T.
-impl<'a, T> Clone for Iter<'a, T> {
-    fn clone(&self) -> Self {
-        Iter {
-            inner: self.inner.clone_box(),
-        }
-    }
-}
-
-impl<'a, T> Iterator for Iter<'a, T> {
-    type Item = &'a T;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner.next()
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.len(), Some(self.len()))
-    }
-}
-
-impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.inner.next_back()
-    }
-}
-
-impl<'a, T> ExactSizeIterator for Iter<'a, T> {
-    fn len(&self) -> usize {
-        self.inner.len()
-    }
-}
-
-impl<'a, T, P> Iterator for PrivateIter<'a, T, P> {
-    type Item = &'a T;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner
-            .next()
-            .map(|pair| &pair.0)
-            .or_else(|| self.last.next())
-    }
-}
-
-impl<'a, T, P> DoubleEndedIterator for PrivateIter<'a, T, P> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.last
-            .next()
-            .or_else(|| self.inner.next_back().map(|pair| &pair.0))
-    }
-}
-
-impl<'a, T, P> ExactSizeIterator for PrivateIter<'a, T, P> {
-    fn len(&self) -> usize {
-        self.inner.len() + self.last.len()
-    }
-}
-
-// No Clone bound on T or P.
-impl<'a, T, P> Clone for PrivateIter<'a, T, P> {
-    fn clone(&self) -> Self {
-        PrivateIter {
-            inner: self.inner.clone(),
-            last: self.last.clone(),
-        }
-    }
-}
-
-impl<'a, T, I> IterTrait<'a, T> for I
-where
-    T: 'a,
-    I: DoubleEndedIterator<Item = &'a T>
-        + ExactSizeIterator<Item = &'a T>
-        + Clone
-        + TrivialDrop
-        + 'a,
-{
-    fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T> + 'a>> {
-        Box::new(NoDrop::new(self.clone()))
-    }
-}
-
-/// An iterator over mutably borrowed values of type `&mut T`.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub struct IterMut<'a, T: 'a> {
-    inner: Box<NoDrop<dyn IterMutTrait<'a, T, Item = &'a mut T> + 'a>>,
-}
-
-trait IterMutTrait<'a, T: 'a>:
-    DoubleEndedIterator<Item = &'a mut T> + ExactSizeIterator<Item = &'a mut T>
-{
-}
-
-struct PrivateIterMut<'a, T: 'a, P: 'a> {
-    inner: slice::IterMut<'a, (T, P)>,
-    last: option::IntoIter<&'a mut T>,
-}
-
-impl<'a, T, P> TrivialDrop for PrivateIterMut<'a, T, P>
-where
-    slice::IterMut<'a, (T, P)>: TrivialDrop,
-    option::IntoIter<&'a mut T>: TrivialDrop,
-{
-}
-
-#[cfg(any(feature = "full", feature = "derive"))]
-pub(crate) fn empty_punctuated_iter_mut<'a, T>() -> IterMut<'a, T> {
-    IterMut {
-        inner: Box::new(NoDrop::new(iter::empty())),
-    }
-}
-
-impl<'a, T> Iterator for IterMut<'a, T> {
-    type Item = &'a mut T;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner.next()
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.len(), Some(self.len()))
-    }
-}
-
-impl<'a, T> DoubleEndedIterator for IterMut<'a, T> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.inner.next_back()
-    }
-}
-
-impl<'a, T> ExactSizeIterator for IterMut<'a, T> {
-    fn len(&self) -> usize {
-        self.inner.len()
-    }
-}
-
-impl<'a, T, P> Iterator for PrivateIterMut<'a, T, P> {
-    type Item = &'a mut T;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.inner
-            .next()
-            .map(|pair| &mut pair.0)
-            .or_else(|| self.last.next())
-    }
-}
-
-impl<'a, T, P> DoubleEndedIterator for PrivateIterMut<'a, T, P> {
-    fn next_back(&mut self) -> Option<Self::Item> {
-        self.last
-            .next()
-            .or_else(|| self.inner.next_back().map(|pair| &mut pair.0))
-    }
-}
-
-impl<'a, T, P> ExactSizeIterator for PrivateIterMut<'a, T, P> {
-    fn len(&self) -> usize {
-        self.inner.len() + self.last.len()
-    }
-}
-
-impl<'a, T, I> IterMutTrait<'a, T> for I
-where
-    T: 'a,
-    I: DoubleEndedIterator<Item = &'a mut T> + ExactSizeIterator<Item = &'a mut T> + 'a,
-{
-}
-
-/// A single syntax tree node of type `T` followed by its trailing punctuation
-/// of type `P` if any.
-///
-/// Refer to the [module documentation] for details about punctuated sequences.
-///
-/// [module documentation]: self
-pub enum Pair<T, P> {
-    Punctuated(T, P),
-    End(T),
-}
-
-impl<T, P> Pair<T, P> {
-    /// Extracts the syntax tree node from this punctuated pair, discarding the
-    /// following punctuation.
-    pub fn into_value(self) -> T {
-        match self {
-            Pair::Punctuated(t, _) | Pair::End(t) => t,
-        }
-    }
-
-    /// Borrows the syntax tree node from this punctuated pair.
-    pub fn value(&self) -> &T {
-        match self {
-            Pair::Punctuated(t, _) | Pair::End(t) => t,
-        }
-    }
-
-    /// Mutably borrows the syntax tree node from this punctuated pair.
-    pub fn value_mut(&mut self) -> &mut T {
-        match self {
-            Pair::Punctuated(t, _) | Pair::End(t) => t,
-        }
-    }
-
-    /// Borrows the punctuation from this punctuated pair, unless this pair is
-    /// the final one and there is no trailing punctuation.
-    pub fn punct(&self) -> Option<&P> {
-        match self {
-            Pair::Punctuated(_, p) => Some(p),
-            Pair::End(_) => None,
-        }
-    }
-
-    /// Mutably borrows the punctuation from this punctuated pair, unless the
-    /// pair is the final one and there is no trailing punctuation.
-    ///
-    /// # Example
-    ///
-    /// ```
-    /// # use proc_macro2::Span;
-    /// # use syn::punctuated::Punctuated;
-    /// # use syn::{parse_quote, Token, TypeParamBound};
-    /// #
-    /// # let mut punctuated = Punctuated::<TypeParamBound, Token![+]>::new();
-    /// # let span = Span::call_site();
-    /// #
-    /// punctuated.insert(0, parse_quote!('lifetime));
-    /// if let Some(punct) = punctuated.pairs_mut().next().unwrap().punct_mut() {
-    ///     punct.span = span;
-    /// }
-    /// ```
-    pub fn punct_mut(&mut self) -> Option<&mut P> {
-        match self {
-            Pair::Punctuated(_, p) => Some(p),
-            Pair::End(_) => None,
-        }
-    }
-
-    /// Creates a punctuated pair out of a syntax tree node and an optional
-    /// following punctuation.
-    pub fn new(t: T, p: Option<P>) -> Self {
-        match p {
-            Some(p) => Pair::Punctuated(t, p),
-            None => Pair::End(t),
-        }
-    }
-
-    /// Produces this punctuated pair as a tuple of syntax tree node and
-    /// optional following punctuation.
-    pub fn into_tuple(self) -> (T, Option<P>) {
-        match self {
-            Pair::Punctuated(t, p) => (t, Some(p)),
-            Pair::End(t) => (t, None),
-        }
-    }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Pair<&T, &P> {
-    pub fn cloned(self) -> Pair<T, P>
-    where
-        T: Clone,
-        P: Clone,
-    {
-        match self {
-            Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()),
-            Pair::End(t) => Pair::End(t.clone()),
-        }
-    }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Clone for Pair<T, P>
-where
-    T: Clone,
-    P: Clone,
-{
-    fn clone(&self) -> Self {
-        match self {
-            Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()),
-            Pair::End(t) => Pair::End(t.clone()),
-        }
-    }
-}
-
-#[cfg(feature = "clone-impls")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
-impl<T, P> Copy for Pair<T, P>
-where
-    T: Copy,
-    P: Copy,
-{
-}
-
-impl<T, P> Index<usize> for Punctuated<T, P> {
-    type Output = T;
-
-    fn index(&self, index: usize) -> &Self::Output {
-        if index == self.len() - 1 {
-            match &self.last {
-                Some(t) => t,
-                None => &self.inner[index].0,
-            }
-        } else {
-            &self.inner[index].0
-        }
-    }
-}
-
-impl<T, P> IndexMut<usize> for Punctuated<T, P> {
-    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
-        if index == self.len() - 1 {
-            match &mut self.last {
-                Some(t) => t,
-                None => &mut self.inner[index].0,
-            }
-        } else {
-            &mut self.inner[index].0
-        }
-    }
-}
-
-#[cfg(feature = "printing")]
-mod printing {
-    use super::*;
-    use proc_macro2::TokenStream;
-    use quote::{ToTokens, TokenStreamExt};
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl<T, P> ToTokens for Punctuated<T, P>
-    where
-        T: ToTokens,
-        P: ToTokens,
-    {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            tokens.append_all(self.pairs());
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl<T, P> ToTokens for Pair<T, P>
-    where
-        T: ToTokens,
-        P: ToTokens,
-    {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            match self {
-                Pair::Punctuated(a, b) => {
-                    a.to_tokens(tokens);
-                    b.to_tokens(tokens);
-                }
-                Pair::End(a) => a.to_tokens(tokens),
-            }
-        }
-    }
-}