Adding upstream version 1.69.0+dfsg1.upstream/1.69.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

20 files changed, 416 insertions, 178 deletions

diff --git a/vendor/syn/.cargo-checksum.json b/vendor/syn/.cargo-checksum.json
index 8b90dae0f..edd04e5cd 100644
--- a/vendor/syn/.cargo-checksum.json
+++ b/vendor/syn/.cargo-checksum.json
@@ -1 +1 @@
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\ No newline at end of file
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2f2b91a6da37069de15","tests/common/mod.rs":"432ad35577f836a20b517d8c26ed994ac25fe73ef2f461c67688b61b99762015","tests/common/parse.rs":"81580f23583723f7a2a337c4d13ebc021057cd825562fb4e474caa7cc641fed9","tests/debug/gen.rs":"1b7f875344cb04a7dd3df62deac2f410a9d107c097986e68006d87465f5f5306","tests/debug/mod.rs":"3a6bb799f478101f71c84c6f1a854a58afe2f9db43c39017909346ca20262d94","tests/macros/mod.rs":"aff805b35cfd55aef6a1359ff747e4023afcb08d69d86aff4c19465d29dda088","tests/regression.rs":"86731134bfb9bb693d9a4fc62393027de80a8bf031109ea6c7ea475b1ebdde8d","tests/regression/issue1108.rs":"adcc55a42239d344da74216ed85fc14153ddd6ca4dec4872d8339604ba78c185","tests/regression/issue1235.rs":"a2266b10c3f7c7af5734817ab0a3e8b309b51e7d177b63f26e67e6b744d280b0","tests/repo/mod.rs":"159c2c4b6416d26ac42ffc35f6cb587c4c1e2b0f24de9aa42b0337a534d7d86d","tests/repo/progress.rs":"c08d0314a7f3ecf760d471f27da3cd2a500aeb9f1c8331bffb2aa648f9fabf3f","tests/test_asyncness.rs":"cff01db49d28ab23b0b258bc6c0a5cc4071be4fe7248eef344a5d79d2fb649b7","tests/test_attribute.rs":"0ffd99384e1a52ae17d9fed5c4053e411e8f9018decef07ffa621d1faa7329d8","tests/test_derive_input.rs":"62bb86aaaaf730187a46ff700a8e3b2d1a163039b109b6a483aa44ed2b6806fe","tests/test_expr.rs":"41eb343829ad36cdea40cd06d45a90765e7fe6f1e47dd550daf1b6096c3a7b44","tests/test_generics.rs":"54b7d2afc19aa6e9049585f4c8f7d3f0c29ac3bd11a2c769e9df76f18a4f5ecb","tests/test_grouping.rs":"6276c3c73bba649dec5c97904ad2492879f918bc887a2c425d095c654ca0d925","tests/test_ident.rs":"9eb53d1e21edf23e7c9e14dc74dcc2b2538e9221e19dbcc0a44e3acc2e90f3f6","tests/test_item.rs":"a3642c80066f1e7787becfd0278af90a6b7968d6c1249e25e81663aa454cfb2a","tests/test_iterators.rs":"9cf6fde17853ce7d5617e1de9ef901c47ca35c0f1c2dd668c0d0604d7b48598c","tests/test_lit.rs":"19740ea9cd4a980bcab9b0dcaa4b032bb6ebb137fa5e4237140b97da1d9679fa","tests/test_meta.rs":"65d4586d131f6cac66694ca5e936748ec4e7f7423af6d8da509240e6be14800b","tests/test_parse_buffer.rs":"68d857f776396d064fcc0023c37093c2fbf75ee68e8241d4014d00d1423c18e9","tests/test_parse_stream.rs":"bf1db6fab7ac396fa61012faccbe6ffbc9c3d795ed2900be75e91c5b09b0c62f","tests/test_pat.rs":"d4465f4fc3fd5d6e534ba8efabe1e0ed6da89de4ac7c96effa6bfb880c4287cf","tests/test_path.rs":"71092a5ae2c9143b92a8fe15a92d39958b3c28bd4d4275cfb2d22cbdd53ada07","tests/test_precedence.rs":"736eee861c4c7a3d7d4387d2fb1b5eced1541790d34974f72b0a5532797e73c3","tests/test_receiver.rs":"084eca59984b9a18651da52f2c4407355da3de1335916a12477652999e2d01cc","tests/test_round_trip.rs":"c3c415413d5177a728c7cbbfb7ef44aebbc6a2c821dd56695156e9e33636fd57","tests/test_shebang.rs":"f5772cadad5b56e3112cb16308b779f92bce1c3a48091fc9933deb2276a69331","tests/test_should_parse.rs":"1d3535698a446e2755bfc360676bdb161841a1f454cdef6e7556c6d06a95c89d","tests/test_size.rs":"6720d55569808244ab011364c39931f06aa509cd05f98ab908b0670e8501b3c8","tests/test_stmt.rs":"0601fc32131b5501dfcdc4b4248d46bf21e0a98a49eb19439e1a46869dfb30b7","tests/test_token_trees.rs":"43e56a701817e3c3bfd0cae54a457dd7a38ccb3ca19da41e2b995fdf20e6ed18","tests/test_ty.rs":"f71d7f7f1c038aaabea8dd4c03c0d5752c76d570f8b4885a81659825bbb4d576","tests/test_visibility.rs":"7456fcb3a6634db509748aededff9c2d8b242d511a3e5ee3022e40b232892704","tests/zzz_stable.rs":"2a862e59cb446235ed99aec0e6ada8e16d3ecc30229b29d825b7c0bbc2602989"},"package":"1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"}
\ No newline at end of file
diff --git a/vendor/syn/Cargo.toml b/vendor/syn/Cargo.toml
index 7b1412593..c2a36013e 100644
--- a/vendor/syn/Cargo.toml
+++ b/vendor/syn/Cargo.toml
@@ -13,7 +13,7 @@
 edition = "2018"
 rust-version = "1.31"
 name = "syn"
-version = "1.0.102"
+version = "1.0.107"
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 include = [
     "/benches/**",
@@ -56,6 +56,9 @@ features = [
     "extra-traits",
 ]
 
+[lib]
+doc-scrape-examples = false
+
 [[bench]]
 name = "rust"
 harness = false
diff --git a/vendor/syn/README.md b/vendor/syn/README.md
index 9c883ae2b..eeef83dd5 100644
--- a/vendor/syn/README.md
+++ b/vendor/syn/README.md
@@ -4,7 +4,7 @@ Parser for Rust source code
 [<img alt="github" src="https://img.shields.io/badge/github-dtolnay/syn-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/syn)
 [<img alt="crates.io" src="https://img.shields.io/crates/v/syn.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/syn)
 [<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-syn-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/syn)
-[<img alt="build status" src="https://img.shields.io/github/workflow/status/dtolnay/syn/CI/master?style=for-the-badge" height="20">](https://github.com/dtolnay/syn/actions?query=branch%3Amaster)
+[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/syn/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/syn/actions?query=branch%3Amaster)
 
 Syn is a parsing library for parsing a stream of Rust tokens into a syntax tree
 of Rust source code.
diff --git a/vendor/syn/src/buffer.rs b/vendor/syn/src/buffer.rs
index 161b614c8..0d5cf30d5 100644
--- a/vendor/syn/src/buffer.rs
+++ b/vendor/syn/src/buffer.rs
@@ -14,6 +14,7 @@
 use crate::proc_macro as pm;
 use crate::Lifetime;
 use proc_macro2::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
+use std::cmp::Ordering;
 use std::marker::PhantomData;
 
 /// Internal type which is used instead of `TokenTree` to represent a token tree
@@ -25,7 +26,8 @@ enum Entry {
     Ident(Ident),
     Punct(Punct),
     Literal(Literal),
-    End,
+    // End entries contain the offset (negative) to the start of the buffer.
+    End(isize),
 }
 
 /// A buffer that can be efficiently traversed multiple times, unlike
@@ -48,10 +50,10 @@ impl TokenBuffer {
                 TokenTree::Literal(literal) => entries.push(Entry::Literal(literal)),
                 TokenTree::Group(group) => {
                     let group_start_index = entries.len();
-                    entries.push(Entry::End); // we replace this below
+                    entries.push(Entry::End(0)); // we replace this below
                     Self::recursive_new(entries, group.stream());
                     let group_end_index = entries.len();
-                    entries.push(Entry::End);
+                    entries.push(Entry::End(-(group_end_index as isize)));
                     let group_end_offset = group_end_index - group_start_index;
                     entries[group_start_index] = Entry::Group(group, group_end_offset);
                 }
@@ -77,7 +79,7 @@ impl TokenBuffer {
     pub fn new2(stream: TokenStream) -> Self {
         let mut entries = Vec::new();
         Self::recursive_new(&mut entries, stream);
-        entries.push(Entry::End);
+        entries.push(Entry::End(-(entries.len() as isize)));
         Self {
             entries: entries.into_boxed_slice(),
         }
@@ -127,7 +129,7 @@ impl<'a> Cursor<'a> {
         // object in global storage.
         struct UnsafeSyncEntry(Entry);
         unsafe impl Sync for UnsafeSyncEntry {}
-        static EMPTY_ENTRY: UnsafeSyncEntry = UnsafeSyncEntry(Entry::End);
+        static EMPTY_ENTRY: UnsafeSyncEntry = UnsafeSyncEntry(Entry::End(0));
 
         Cursor {
             ptr: &EMPTY_ENTRY.0,
@@ -144,7 +146,7 @@ impl<'a> Cursor<'a> {
         // past it, unless `ptr == scope`, which means that we're at the edge of
         // our cursor's scope. We should only have `ptr != scope` at the exit
         // from None-delimited groups entered with `ignore_none`.
-        while let Entry::End = *ptr {
+        while let Entry::End(_) = *ptr {
             if ptr == scope {
                 break;
             }
@@ -292,7 +294,7 @@ impl<'a> Cursor<'a> {
             Entry::Literal(literal) => (literal.clone().into(), 1),
             Entry::Ident(ident) => (ident.clone().into(), 1),
             Entry::Punct(punct) => (punct.clone().into(), 1),
-            Entry::End => return None,
+            Entry::End(_) => return None,
         };
 
         let rest = unsafe { Cursor::create(self.ptr.add(len), self.scope) };
@@ -307,7 +309,7 @@ impl<'a> Cursor<'a> {
             Entry::Literal(literal) => literal.span(),
             Entry::Ident(ident) => ident.span(),
             Entry::Punct(punct) => punct.span(),
-            Entry::End => Span::call_site(),
+            Entry::End(_) => Span::call_site(),
         }
     }
 
@@ -317,7 +319,7 @@ impl<'a> Cursor<'a> {
     /// This method treats `'lifetimes` as a single token.
     pub(crate) fn skip(self) -> Option<Cursor<'a>> {
         let len = match self.entry() {
-            Entry::End => return None,
+            Entry::End(_) => return None,
 
             // Treat lifetimes as a single tt for the purposes of 'skip'.
             Entry::Punct(punct) if punct.as_char() == '\'' && punct.spacing() == Spacing::Joint => {
@@ -347,9 +349,17 @@ impl<'a> Eq for Cursor<'a> {}
 
 impl<'a> PartialEq for Cursor<'a> {
     fn eq(&self, other: &Self) -> bool {
-        let Cursor { ptr, scope, marker } = self;
-        let _ = marker;
-        *ptr == other.ptr && *scope == other.scope
+        self.ptr == other.ptr
+    }
+}
+
+impl<'a> PartialOrd for Cursor<'a> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        if same_buffer(*self, *other) {
+            Some(self.ptr.cmp(&other.ptr))
+        } else {
+            None
+        }
     }
 }
 
@@ -357,6 +367,22 @@ pub(crate) fn same_scope(a: Cursor, b: Cursor) -> bool {
     a.scope == b.scope
 }
 
+pub(crate) fn same_buffer(a: Cursor, b: Cursor) -> bool {
+    unsafe {
+        match (&*a.scope, &*b.scope) {
+            (Entry::End(a_offset), Entry::End(b_offset)) => {
+                a.scope.offset(*a_offset) == b.scope.offset(*b_offset)
+            }
+            _ => unreachable!(),
+        }
+    }
+}
+
+#[cfg(any(feature = "full", feature = "derive"))]
+pub(crate) fn cmp_assuming_same_buffer(a: Cursor, b: Cursor) -> Ordering {
+    a.ptr.cmp(&b.ptr)
+}
+
 pub(crate) fn open_span_of_group(cursor: Cursor) -> Span {
     match cursor.entry() {
         Entry::Group(group, _) => group.span_open(),
diff --git a/vendor/syn/src/drops.rs b/vendor/syn/src/drops.rs
new file mode 100644
index 000000000..89b42d82e
--- /dev/null
+++ b/vendor/syn/src/drops.rs
@@ -0,0 +1,58 @@
+use std::iter;
+use std::mem::ManuallyDrop;
+use std::ops::{Deref, DerefMut};
+use std::option;
+use std::slice;
+
+#[repr(transparent)]
+pub(crate) struct NoDrop<T: ?Sized>(ManuallyDrop<T>);
+
+impl<T> NoDrop<T> {
+    pub(crate) fn new(value: T) -> Self
+    where
+        T: TrivialDrop,
+    {
+        NoDrop(ManuallyDrop::new(value))
+    }
+}
+
+impl<T: ?Sized> Deref for NoDrop<T> {
+    type Target = T;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T: ?Sized> DerefMut for NoDrop<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+pub(crate) trait TrivialDrop {}
+
+impl<T> TrivialDrop for iter::Empty<T> {}
+impl<'a, T> TrivialDrop for slice::Iter<'a, T> {}
+impl<'a, T> TrivialDrop for slice::IterMut<'a, T> {}
+impl<'a, T> TrivialDrop for option::IntoIter<&'a T> {}
+impl<'a, T> TrivialDrop for option::IntoIter<&'a mut T> {}
+
+#[test]
+fn test_needs_drop() {
+    use std::mem::needs_drop;
+
+    struct NeedsDrop;
+
+    impl Drop for NeedsDrop {
+        fn drop(&mut self) {}
+    }
+
+    assert!(needs_drop::<NeedsDrop>());
+
+    // Test each of the types with a handwritten TrivialDrop impl above.
+    assert!(!needs_drop::<iter::Empty<NeedsDrop>>());
+    assert!(!needs_drop::<slice::Iter<NeedsDrop>>());
+    assert!(!needs_drop::<slice::IterMut<NeedsDrop>>());
+    assert!(!needs_drop::<option::IntoIter<&NeedsDrop>>());
+    assert!(!needs_drop::<option::IntoIter<&mut NeedsDrop>>());
+}
diff --git a/vendor/syn/src/error.rs b/vendor/syn/src/error.rs
index 609cc086f..e301367d5 100644
--- a/vendor/syn/src/error.rs
+++ b/vendor/syn/src/error.rs
@@ -134,12 +134,16 @@ impl Error {
     /// }
     /// ```
     pub fn new<T: Display>(span: Span, message: T) -> Self {
-        Error {
-            messages: vec![ErrorMessage {
-                start_span: ThreadBound::new(span),
-                end_span: ThreadBound::new(span),
-                message: message.to_string(),
-            }],
+        return new(span, message.to_string());
+
+        fn new(span: Span, message: String) -> Error {
+            Error {
+                messages: vec![ErrorMessage {
+                    start_span: ThreadBound::new(span),
+                    end_span: ThreadBound::new(span),
+                    message,
+                }],
+            }
         }
     }
 
@@ -158,15 +162,19 @@ impl Error {
     /// `ParseStream::error`)!
     #[cfg(feature = "printing")]
     pub fn new_spanned<T: ToTokens, U: Display>(tokens: T, message: U) -> Self {
-        let mut iter = tokens.into_token_stream().into_iter();
-        let start = iter.next().map_or_else(Span::call_site, |t| t.span());
-        let end = iter.last().map_or(start, |t| t.span());
-        Error {
-            messages: vec![ErrorMessage {
-                start_span: ThreadBound::new(start),
-                end_span: ThreadBound::new(end),
-                message: message.to_string(),
-            }],
+        return new_spanned(tokens.into_token_stream(), message.to_string());
+
+        fn new_spanned(tokens: TokenStream, message: String) -> Error {
+            let mut iter = tokens.into_iter();
+            let start = iter.next().map_or_else(Span::call_site, |t| t.span());
+            let end = iter.last().map_or(start, |t| t.span());
+            Error {
+                messages: vec![ErrorMessage {
+                    start_span: ThreadBound::new(start),
+                    end_span: ThreadBound::new(end),
+                    message,
+                }],
+            }
         }
     }
 
@@ -288,12 +296,16 @@ pub fn new_at<T: Display>(scope: Span, cursor: Cursor, message: T) -> Error {
 
 #[cfg(all(feature = "parsing", any(feature = "full", feature = "derive")))]
 pub fn new2<T: Display>(start: Span, end: Span, message: T) -> Error {
-    Error {
-        messages: vec![ErrorMessage {
-            start_span: ThreadBound::new(start),
-            end_span: ThreadBound::new(end),
-            message: message.to_string(),
-        }],
+    return new2(start, end, message.to_string());
+
+    fn new2(start: Span, end: Span, message: String) -> Error {
+        Error {
+            messages: vec![ErrorMessage {
+                start_span: ThreadBound::new(start),
+                end_span: ThreadBound::new(end),
+                message,
+            }],
+        }
     }
 }
 
diff --git a/vendor/syn/src/generics.rs b/vendor/syn/src/generics.rs
index 9c2802f87..6d4fe847e 100644
--- a/vendor/syn/src/generics.rs
+++ b/vendor/syn/src/generics.rs
@@ -828,6 +828,31 @@ pub mod parsing {
         }
     }
 
+    impl TypeParamBound {
+        pub(crate) fn parse_multiple(
+            input: ParseStream,
+            allow_plus: bool,
+        ) -> Result<Punctuated<Self, Token![+]>> {
+            let mut bounds = Punctuated::new();
+            loop {
+                bounds.push_value(input.parse()?);
+                if !(allow_plus && input.peek(Token![+])) {
+                    break;
+                }
+                bounds.push_punct(input.parse()?);
+                if !(input.peek(Ident::peek_any)
+                    || input.peek(Token![::])
+                    || input.peek(Token![?])
+                    || input.peek(Lifetime)
+                    || input.peek(token::Paren))
+                {
+                    break;
+                }
+            }
+            Ok(bounds)
+        }
+    }
+
     #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
     impl Parse for TraitBound {
         fn parse(input: ParseStream) -> Result<Self> {
diff --git a/vendor/syn/src/lib.rs b/vendor/syn/src/lib.rs
index 81f03e1b5..e47ba28c6 100644
--- a/vendor/syn/src/lib.rs
+++ b/vendor/syn/src/lib.rs
@@ -250,13 +250,14 @@
 //!   dynamic library libproc_macro from rustc toolchain.
 
 // Syn types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/syn/1.0.102")]
+#![doc(html_root_url = "https://docs.rs/syn/1.0.107")]
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
 #![allow(non_camel_case_types)]
 #![allow(
     clippy::bool_to_int_with_if,
     clippy::cast_lossless,
     clippy::cast_possible_truncation,
+    clippy::cast_possible_wrap,
     clippy::cast_ptr_alignment,
     clippy::default_trait_access,
     clippy::doc_markdown,
@@ -264,8 +265,8 @@
     clippy::explicit_auto_deref,
     clippy::if_not_else,
     clippy::inherent_to_string,
+    clippy::items_after_statements,
     clippy::large_enum_variant,
-    clippy::let_underscore_drop,
     clippy::manual_assert,
     clippy::match_on_vec_items,
     clippy::match_same_arms,
@@ -428,6 +429,7 @@ pub use crate::path::{
 #[cfg(feature = "parsing")]
 #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
 pub mod buffer;
+mod drops;
 #[cfg(feature = "parsing")]
 #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
 pub mod ext;
diff --git a/vendor/syn/src/path.rs b/vendor/syn/src/path.rs
index 742273afd..6cdb43ac5 100644
--- a/vendor/syn/src/path.rs
+++ b/vendor/syn/src/path.rs
@@ -89,9 +89,8 @@ impl PathArguments {
         }
     }
 
-    #[cfg(feature = "parsing")]
-    fn is_none(&self) -> bool {
-        match *self {
+    pub fn is_none(&self) -> bool {
+        match self {
             PathArguments::None => true,
             PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => false,
         }
diff --git a/vendor/syn/src/punctuated.rs b/vendor/syn/src/punctuated.rs
index 0fe1078cf..b7d0185e8 100644
--- a/vendor/syn/src/punctuated.rs
+++ b/vendor/syn/src/punctuated.rs
@@ -32,6 +32,7 @@ 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")]
@@ -104,10 +105,10 @@ impl<T, P> Punctuated<T, P> {
     /// Returns an iterator over borrowed syntax tree nodes of type `&T`.
     pub fn iter(&self) -> Iter<T> {
         Iter {
-            inner: Box::new(PrivateIter {
+            inner: Box::new(NoDrop::new(PrivateIter {
                 inner: self.inner.iter(),
                 last: self.last.as_ref().map(Box::as_ref).into_iter(),
-            }),
+            })),
         }
     }
 
@@ -115,10 +116,10 @@ impl<T, P> Punctuated<T, P> {
     /// `&mut T`.
     pub fn iter_mut(&mut self) -> IterMut<T> {
         IterMut {
-            inner: Box::new(PrivateIterMut {
+            inner: Box::new(NoDrop::new(PrivateIterMut {
                 inner: self.inner.iter_mut(),
                 last: self.last.as_mut().map(Box::as_mut).into_iter(),
-            }),
+            })),
         }
     }
 
@@ -721,13 +722,13 @@ pub struct Iter<'a, T: 'a> {
     // The `Item = &'a T` needs to be specified to support rustc 1.31 and older.
     // On modern compilers we would be able to write just IterTrait<'a, T> where
     // Item can be inferred unambiguously from the supertrait.
-    inner: Box<dyn IterTrait<'a, T, Item = &'a T> + 'a>,
+    inner: Box<NoDrop<dyn IterTrait<'a, T, Item = &'a T> + 'a>>,
 }
 
 trait IterTrait<'a, T: 'a>:
     DoubleEndedIterator<Item = &'a T> + ExactSizeIterator<Item = &'a T>
 {
-    fn clone_box(&self) -> Box<dyn IterTrait<'a, T, Item = &'a T> + 'a>;
+    fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T, Item = &'a T> + 'a>>;
 }
 
 struct PrivateIter<'a, T: 'a, P: 'a> {
@@ -735,10 +736,17 @@ struct PrivateIter<'a, T: 'a, P: 'a> {
     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(iter::empty()),
+        inner: Box::new(NoDrop::new(iter::empty())),
     }
 }
 
@@ -813,10 +821,14 @@ impl<'a, T, P> Clone for PrivateIter<'a, T, P> {
 impl<'a, T, I> IterTrait<'a, T> for I
 where
     T: 'a,
-    I: DoubleEndedIterator<Item = &'a T> + ExactSizeIterator<Item = &'a T> + Clone + 'a,
+    I: DoubleEndedIterator<Item = &'a T>
+        + ExactSizeIterator<Item = &'a T>
+        + Clone
+        + TrivialDrop
+        + 'a,
 {
-    fn clone_box(&self) -> Box<dyn IterTrait<'a, T, Item = &'a T> + 'a> {
-        Box::new(self.clone())
+    fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T, Item = &'a T> + 'a>> {
+        Box::new(NoDrop::new(self.clone()))
     }
 }
 
@@ -826,7 +838,7 @@ where
 ///
 /// [module documentation]: self
 pub struct IterMut<'a, T: 'a> {
-    inner: Box<dyn IterMutTrait<'a, T, Item = &'a mut T> + 'a>,
+    inner: Box<NoDrop<dyn IterMutTrait<'a, T, Item = &'a mut T> + 'a>>,
 }
 
 trait IterMutTrait<'a, T: 'a>:
@@ -839,10 +851,17 @@ struct PrivateIterMut<'a, T: 'a, P: 'a> {
     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(iter::empty()),
+        inner: Box::new(NoDrop::new(iter::empty())),
     }
 }
 
diff --git a/vendor/syn/src/ty.rs b/vendor/syn/src/ty.rs
index 4068be3c7..8c841e2f7 100644
--- a/vendor/syn/src/ty.rs
+++ b/vendor/syn/src/ty.rs
@@ -337,7 +337,7 @@ pub mod parsing {
     use crate::ext::IdentExt;
     use crate::parse::{Parse, ParseStream, Result};
     use crate::path;
-    use proc_macro2::{Punct, Spacing, TokenTree};
+    use proc_macro2::{Punct, Spacing, Span, TokenTree};
 
     #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
     impl Parse for Type {
@@ -546,13 +546,17 @@ pub mod parsing {
             || lookahead.peek(Token![<])
         {
             let dyn_token: Option<Token![dyn]> = input.parse()?;
-            if dyn_token.is_some() {
+            if let Some(dyn_token) = dyn_token {
+                let dyn_span = dyn_token.span;
                 let star_token: Option<Token![*]> = input.parse()?;
-                let bounds = TypeTraitObject::parse_bounds(input, allow_plus)?;
+                let bounds = TypeTraitObject::parse_bounds(dyn_span, input, allow_plus)?;
                 return Ok(if star_token.is_some() {
                     Type::Verbatim(verbatim::between(begin, input))
                 } else {
-                    Type::TraitObject(TypeTraitObject { dyn_token, bounds })
+                    Type::TraitObject(TypeTraitObject {
+                        dyn_token: Some(dyn_token),
+                        bounds,
+                    })
                 });
             }
 
@@ -896,15 +900,6 @@ pub mod parsing {
         }
     }
 
-    fn at_least_one_type(bounds: &Punctuated<TypeParamBound, Token![+]>) -> bool {
-        for bound in bounds {
-            if let TypeParamBound::Trait(_) = *bound {
-                return true;
-            }
-        }
-        false
-    }
-
     impl TypeTraitObject {
         #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
         pub fn without_plus(input: ParseStream) -> Result<Self> {
@@ -914,35 +909,38 @@ pub mod parsing {
 
         // Only allow multiple trait references if allow_plus is true.
         pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
-            Ok(TypeTraitObject {
-                dyn_token: input.parse()?,
-                bounds: Self::parse_bounds(input, allow_plus)?,
-            })
+            let dyn_token: Option<Token![dyn]> = input.parse()?;
+            let dyn_span = match &dyn_token {
+                Some(token) => token.span,
+                None => input.span(),
+            };
+            let bounds = Self::parse_bounds(dyn_span, input, allow_plus)?;
+            Ok(TypeTraitObject { dyn_token, bounds })
         }
 
         fn parse_bounds(
+            dyn_span: Span,
             input: ParseStream,
             allow_plus: bool,
         ) -> Result<Punctuated<TypeParamBound, Token![+]>> {
-            let mut bounds = Punctuated::new();
-            loop {
-                bounds.push_value(input.parse()?);
-                if !(allow_plus && input.peek(Token![+])) {
-                    break;
-                }
-                bounds.push_punct(input.parse()?);
-                if !(input.peek(Ident::peek_any)
-                    || input.peek(Token![::])
-                    || input.peek(Token![?])
-                    || input.peek(Lifetime)
-                    || input.peek(token::Paren))
-                {
-                    break;
+            let bounds = TypeParamBound::parse_multiple(input, allow_plus)?;
+            let mut last_lifetime_span = None;
+            let mut at_least_one_trait = false;
+            for bound in &bounds {
+                match bound {
+                    TypeParamBound::Trait(_) => {
+                        at_least_one_trait = true;
+                        break;
+                    }
+                    TypeParamBound::Lifetime(lifetime) => {
+                        last_lifetime_span = Some(lifetime.ident.span());
+                    }
                 }
             }
             // Just lifetimes like `'a + 'b` is not a TraitObject.
-            if !at_least_one_type(&bounds) {
-                return Err(input.error("expected at least one type"));
+            if !at_least_one_trait {
+                let msg = "at least one trait is required for an object type";
+                return Err(error::new2(dyn_span, last_lifetime_span.unwrap(), msg));
             }
             Ok(bounds)
         }
@@ -964,10 +962,30 @@ pub mod parsing {
         }
 
         pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
-            Ok(TypeImplTrait {
-                impl_token: input.parse()?,
-                bounds: TypeTraitObject::parse_bounds(input, allow_plus)?,
-            })
+            let impl_token: Token![impl] = input.parse()?;
+            let bounds = TypeParamBound::parse_multiple(input, allow_plus)?;
+            let mut last_lifetime_span = None;
+            let mut at_least_one_trait = false;
+            for bound in &bounds {
+                match bound {
+                    TypeParamBound::Trait(_) => {
+                        at_least_one_trait = true;
+                        break;
+                    }
+                    TypeParamBound::Lifetime(lifetime) => {
+                        last_lifetime_span = Some(lifetime.ident.span());
+                    }
+                }
+            }
+            if !at_least_one_trait {
+                let msg = "at least one trait must be specified";
+                return Err(error::new2(
+                    impl_token.span,
+                    last_lifetime_span.unwrap(),
+                    msg,
+                ));
+            }
+            Ok(TypeImplTrait { impl_token, bounds })
         }
     }
 
diff --git a/vendor/syn/src/verbatim.rs b/vendor/syn/src/verbatim.rs
index 0686352f7..58cf68d17 100644
--- a/vendor/syn/src/verbatim.rs
+++ b/vendor/syn/src/verbatim.rs
@@ -1,13 +1,31 @@
 use crate::parse::{ParseBuffer, ParseStream};
-use proc_macro2::TokenStream;
+use proc_macro2::{Delimiter, TokenStream};
+use std::cmp::Ordering;
 use std::iter;
 
 pub fn between<'a>(begin: ParseBuffer<'a>, end: ParseStream<'a>) -> TokenStream {
     let end = end.cursor();
     let mut cursor = begin.cursor();
+    assert!(crate::buffer::same_buffer(end, cursor));
+
     let mut tokens = TokenStream::new();
     while cursor != end {
         let (tt, next) = cursor.token_tree().unwrap();
+
+        if crate::buffer::cmp_assuming_same_buffer(end, next) == Ordering::Less {
+            // A syntax node can cross the boundary of a None-delimited group
+            // due to such groups being transparent to the parser in most cases.
+            // Any time this occurs the group is known to be semantically
+            // irrelevant. https://github.com/dtolnay/syn/issues/1235
+            if let Some((inside, _span, after)) = cursor.group(Delimiter::None) {
+                assert!(next == after);
+                cursor = inside;
+                continue;
+            } else {
+                panic!("verbatim end must not be inside a delimited group");
+            }
+        }
+
         tokens.extend(iter::once(tt));
         cursor = next;
     }
diff --git a/vendor/syn/tests/common/eq.rs b/vendor/syn/tests/common/eq.rs
index a53146241..41d6d4118 100644
--- a/vendor/syn/tests/common/eq.rs
+++ b/vendor/syn/tests/common/eq.rs
@@ -13,6 +13,8 @@ use rustc_ast::ast::AssocConstraint;
 use rustc_ast::ast::AssocConstraintKind;
 use rustc_ast::ast::AssocItemKind;
 use rustc_ast::ast::Async;
+use rustc_ast::ast::AttrArgs;
+use rustc_ast::ast::AttrArgsEq;
 use rustc_ast::ast::AttrId;
 use rustc_ast::ast::AttrItem;
 use rustc_ast::ast::AttrKind;
@@ -26,10 +28,12 @@ use rustc_ast::ast::BlockCheckMode;
 use rustc_ast::ast::BorrowKind;
 use rustc_ast::ast::ByRef;
 use rustc_ast::ast::CaptureBy;
+use rustc_ast::ast::Closure;
 use rustc_ast::ast::ClosureBinder;
 use rustc_ast::ast::Const;
 use rustc_ast::ast::Crate;
 use rustc_ast::ast::Defaultness;
+use rustc_ast::ast::DelimArgs;
 use rustc_ast::ast::EnumDef;
 use rustc_ast::ast::Expr;
 use rustc_ast::ast::ExprField;
@@ -65,19 +69,18 @@ use rustc_ast::ast::Item;
 use rustc_ast::ast::ItemKind;
 use rustc_ast::ast::Label;
 use rustc_ast::ast::Lifetime;
-use rustc_ast::ast::Lit;
 use rustc_ast::ast::LitFloatType;
 use rustc_ast::ast::LitIntType;
 use rustc_ast::ast::LitKind;
 use rustc_ast::ast::Local;
 use rustc_ast::ast::LocalKind;
-use rustc_ast::ast::MacArgs;
-use rustc_ast::ast::MacArgsEq;
 use rustc_ast::ast::MacCall;
 use rustc_ast::ast::MacCallStmt;
 use rustc_ast::ast::MacDelimiter;
 use rustc_ast::ast::MacStmtStyle;
 use rustc_ast::ast::MacroDef;
+use rustc_ast::ast::MetaItemLit;
+use rustc_ast::ast::MethodCall;
 use rustc_ast::ast::ModKind;
 use rustc_ast::ast::ModSpans;
 use rustc_ast::ast::Movability;
@@ -128,7 +131,7 @@ use rustc_ast::ast::WhereEqPredicate;
 use rustc_ast::ast::WherePredicate;
 use rustc_ast::ast::WhereRegionPredicate;
 use rustc_ast::ptr::P;
-use rustc_ast::token::{self, CommentKind, Delimiter, Nonterminal, Token, TokenKind};
+use rustc_ast::token::{self, CommentKind, Delimiter, Lit, Nonterminal, Token, TokenKind};
 use rustc_ast::tokenstream::{
     AttrTokenStream, AttrTokenTree, AttributesData, DelimSpan, LazyAttrTokenStream, Spacing,
     TokenStream, TokenTree,
@@ -411,7 +414,9 @@ spanless_eq_struct!(AttributesData; attrs tokens);
 spanless_eq_struct!(BareFnTy; unsafety ext generic_params decl decl_span);
 spanless_eq_struct!(BindingAnnotation; 0 1);
 spanless_eq_struct!(Block; stmts id rules span tokens could_be_bare_literal);
+spanless_eq_struct!(Closure; binder capture_clause asyncness movability fn_decl body !fn_decl_span);
 spanless_eq_struct!(Crate; attrs items spans id is_placeholder);
+spanless_eq_struct!(DelimArgs; dspan delim tokens);
 spanless_eq_struct!(EnumDef; variants);
 spanless_eq_struct!(Expr; id kind span attrs !tokens);
 spanless_eq_struct!(ExprField; attrs id span ident expr is_shorthand is_placeholder);
@@ -429,11 +434,13 @@ spanless_eq_struct!(InlineAsmSym; id qself path);
 spanless_eq_struct!(Item<K>; attrs id span vis ident kind !tokens);
 spanless_eq_struct!(Label; ident);
 spanless_eq_struct!(Lifetime; id ident);
-spanless_eq_struct!(Lit; token_lit kind span);
+spanless_eq_struct!(Lit; kind symbol suffix);
 spanless_eq_struct!(Local; pat ty kind id span attrs !tokens);
 spanless_eq_struct!(MacCall; path args prior_type_ascription);
 spanless_eq_struct!(MacCallStmt; mac style attrs tokens);
 spanless_eq_struct!(MacroDef; body macro_rules);
+spanless_eq_struct!(MetaItemLit; token_lit kind span);
+spanless_eq_struct!(MethodCall; seg receiver args !span);
 spanless_eq_struct!(ModSpans; !inner_span !inject_use_span);
 spanless_eq_struct!(MutTy; ty mutbl);
 spanless_eq_struct!(NormalAttr; item tokens);
@@ -460,11 +467,12 @@ spanless_eq_struct!(WhereBoundPredicate; span bound_generic_params bounded_ty bo
 spanless_eq_struct!(WhereClause; has_where_token predicates span);
 spanless_eq_struct!(WhereEqPredicate; span lhs_ty rhs_ty);
 spanless_eq_struct!(WhereRegionPredicate; span lifetime bounds);
-spanless_eq_struct!(token::Lit; kind symbol suffix);
 spanless_eq_enum!(AngleBracketedArg; Arg(0) Constraint(0));
-spanless_eq_enum!(AssocItemKind; Const(0 1 2) Fn(0) TyAlias(0) MacCall(0));
+spanless_eq_enum!(AssocItemKind; Const(0 1 2) Fn(0) Type(0) MacCall(0));
 spanless_eq_enum!(AssocConstraintKind; Equality(term) Bound(bounds));
 spanless_eq_enum!(Async; Yes(span closure_id return_impl_trait_id) No);
+spanless_eq_enum!(AttrArgs; Empty Delimited(0) Eq(0 1));
+spanless_eq_enum!(AttrArgsEq; Ast(0) Hir(0));
 spanless_eq_enum!(AttrStyle; Outer Inner);
 spanless_eq_enum!(AttrTokenTree; Token(0 1) Delimited(0 1 2) Attributes(0));
 spanless_eq_enum!(BinOpKind; Add Sub Mul Div Rem And Or BitXor BitAnd BitOr Shl Shr Eq Lt Le Ne Ge Gt);
@@ -492,8 +500,6 @@ spanless_eq_enum!(IsAuto; Yes No);
 spanless_eq_enum!(LitFloatType; Suffixed(0) Unsuffixed);
 spanless_eq_enum!(LitIntType; Signed(0) Unsigned(0) Unsuffixed);
 spanless_eq_enum!(LocalKind; Decl Init(0) InitElse(0 1));
-spanless_eq_enum!(MacArgs; Empty Delimited(0 1 2) Eq(0 1));
-spanless_eq_enum!(MacArgsEq; Ast(0) Hir(0));
 spanless_eq_enum!(MacDelimiter; Parenthesis Bracket Brace);
 spanless_eq_enum!(MacStmtStyle; Semicolon Braces NoBraces);
 spanless_eq_enum!(ModKind; Loaded(0 1 2) Unloaded);
@@ -512,18 +518,18 @@ spanless_eq_enum!(UintTy; Usize U8 U16 U32 U64 U128);
 spanless_eq_enum!(UnOp; Deref Not Neg);
 spanless_eq_enum!(Unsafe; Yes(0) No);
 spanless_eq_enum!(UnsafeSource; CompilerGenerated UserProvided);
-spanless_eq_enum!(UseTreeKind; Simple(0 1 2) Nested(0) Glob);
+spanless_eq_enum!(UseTreeKind; Simple(0) Nested(0) Glob);
 spanless_eq_enum!(VariantData; Struct(0 1) Tuple(0 1) Unit(0));
 spanless_eq_enum!(VisibilityKind; Public Restricted(path id shorthand) Inherited);
 spanless_eq_enum!(WherePredicate; BoundPredicate(0) RegionPredicate(0) EqPredicate(0));
 spanless_eq_enum!(ExprKind; Box(0) Array(0) ConstBlock(0) Call(0 1)
-    MethodCall(0 1 2 3) Tup(0) Binary(0 1 2) Unary(0 1) Lit(0) Cast(0 1)
-    Type(0 1) Let(0 1 2) If(0 1 2) While(0 1 2) ForLoop(0 1 2 3) Loop(0 1)
-    Match(0 1) Closure(0 1 2 3 4 5 6) Block(0 1) Async(0 1 2) Await(0)
-    TryBlock(0) Assign(0 1 2) AssignOp(0 1 2) Field(0 1) Index(0 1) Underscore
-    Range(0 1 2) Path(0 1) AddrOf(0 1 2) Break(0 1) Continue(0) Ret(0)
-    InlineAsm(0) MacCall(0) Struct(0) Repeat(0 1) Paren(0) Try(0) Yield(0)
-    Yeet(0) Err);
+    MethodCall(0) Tup(0) Binary(0 1 2) Unary(0 1) Lit(0) Cast(0 1) Type(0 1)
+    Let(0 1 2) If(0 1 2) While(0 1 2) ForLoop(0 1 2 3) Loop(0 1 2) Match(0 1)
+    Closure(0) Block(0 1) Async(0 1 2) Await(0) TryBlock(0) Assign(0 1 2)
+    AssignOp(0 1 2) Field(0 1) Index(0 1) Underscore Range(0 1 2) Path(0 1)
+    AddrOf(0 1 2) Break(0 1) Continue(0) Ret(0) InlineAsm(0) MacCall(0)
+    Struct(0) Repeat(0 1) Paren(0) Try(0) Yield(0) Yeet(0) IncludedBytes(0)
+    Err);
 spanless_eq_enum!(InlineAsmOperand; In(reg expr) Out(reg late expr)
     InOut(reg late expr) SplitInOut(reg late in_expr out_expr) Const(anon_const)
     Sym(sym));
@@ -697,8 +703,8 @@ fn is_escaped_literal_token(token: &Token, unescaped: Symbol) -> bool {
         Token {
             kind: TokenKind::Literal(lit),
             span: _,
-        } => match Lit::from_token_lit(*lit, DUMMY_SP) {
-            Ok(lit) => is_escaped_literal(&lit, unescaped),
+        } => match MetaItemLit::from_token_lit(*lit, DUMMY_SP) {
+            Ok(lit) => is_escaped_literal_meta_item_lit(&lit, unescaped),
             Err(_) => false,
         },
         Token {
@@ -706,7 +712,7 @@ fn is_escaped_literal_token(token: &Token, unescaped: Symbol) -> bool {
             span: _,
         } => match nonterminal.as_ref() {
             Nonterminal::NtExpr(expr) => match &expr.kind {
-                ExprKind::Lit(lit) => is_escaped_literal(lit, unescaped),
+                ExprKind::Lit(lit) => is_escaped_lit(lit, unescaped),
                 _ => false,
             },
             _ => false,
@@ -715,28 +721,51 @@ fn is_escaped_literal_token(token: &Token, unescaped: Symbol) -> bool {
     }
 }
 
-fn is_escaped_literal_macro_arg(arg: &MacArgsEq, unescaped: Symbol) -> bool {
-    match arg {
-        MacArgsEq::Ast(expr) => match &expr.kind {
-            ExprKind::Lit(lit) => is_escaped_literal(lit, unescaped),
+fn is_escaped_literal_attr_args(value: &AttrArgsEq, unescaped: Symbol) -> bool {
+    match value {
+        AttrArgsEq::Ast(expr) => match &expr.kind {
+            ExprKind::Lit(lit) => is_escaped_lit(lit, unescaped),
             _ => false,
         },
-        MacArgsEq::Hir(lit) => is_escaped_literal(lit, unescaped),
+        AttrArgsEq::Hir(lit) => is_escaped_literal_meta_item_lit(lit, unescaped),
     }
 }
 
-fn is_escaped_literal(lit: &Lit, unescaped: Symbol) -> bool {
+fn is_escaped_literal_meta_item_lit(lit: &MetaItemLit, unescaped: Symbol) -> bool {
     match lit {
-        Lit {
+        MetaItemLit {
             token_lit:
-                token::Lit {
+                Lit {
                     kind: token::LitKind::Str,
                     symbol: _,
                     suffix: None,
                 },
-            kind: LitKind::Str(symbol, StrStyle::Cooked),
+            kind,
             span: _,
-        } => symbol.as_str().replace('\r', "") == unescaped.as_str().replace('\r', ""),
+        } => is_escaped_lit_kind(kind, unescaped),
+        _ => false,
+    }
+}
+
+fn is_escaped_lit(lit: &Lit, unescaped: Symbol) -> bool {
+    match lit {
+        Lit {
+            kind: token::LitKind::Str,
+            symbol: _,
+            suffix: None,
+        } => match LitKind::from_token_lit(*lit) {
+            Ok(lit_kind) => is_escaped_lit_kind(&lit_kind, unescaped),
+            _ => false,
+        },
+        _ => false,
+    }
+}
+
+fn is_escaped_lit_kind(kind: &LitKind, unescaped: Symbol) -> bool {
+    match kind {
+        LitKind::Str(symbol, StrStyle::Cooked) => {
+            symbol.as_str().replace('\r', "") == unescaped.as_str().replace('\r', "")
+        }
         _ => false,
     }
 }
@@ -765,9 +794,9 @@ impl SpanlessEq for AttrKind {
                 let path = Path::from_ident(Ident::with_dummy_span(sym::doc));
                 SpanlessEq::eq(&path, &normal2.item.path)
                     && match &normal2.item.args {
-                        MacArgs::Empty | MacArgs::Delimited(..) => false,
-                        MacArgs::Eq(_span, token) => {
-                            is_escaped_literal_macro_arg(token, *unescaped)
+                        AttrArgs::Empty | AttrArgs::Delimited(_) => false,
+                        AttrArgs::Eq(_span, value) => {
+                            is_escaped_literal_attr_args(value, *unescaped)
                         }
                     }
             }
diff --git a/vendor/syn/tests/regression.rs b/vendor/syn/tests/regression.rs
index 8311a91bf..fb2b25c89 100644
--- a/vendor/syn/tests/regression.rs
+++ b/vendor/syn/tests/regression.rs
@@ -1,5 +1,3 @@
-#![allow(clippy::let_underscore_drop)]
-
 mod regression {
     automod::dir!("tests/regression");
 }
diff --git a/vendor/syn/tests/regression/issue1235.rs b/vendor/syn/tests/regression/issue1235.rs
new file mode 100644
index 000000000..883603066
--- /dev/null
+++ b/vendor/syn/tests/regression/issue1235.rs
@@ -0,0 +1,32 @@
+use proc_macro2::{Delimiter, Group};
+use quote::quote;
+
+#[test]
+fn main() {
+    // Okay. Rustc allows top-level `static` with no value syntactically, but
+    // not semantically. Syn parses as Item::Verbatim.
+    let tokens = quote! {
+        pub static FOO: usize;
+        pub static BAR: usize;
+    };
+    let file = syn::parse2::<syn::File>(tokens).unwrap();
+    println!("{:#?}", file);
+
+    // Okay.
+    let inner = Group::new(
+        Delimiter::None,
+        quote!(static FOO: usize = 0; pub static BAR: usize = 0),
+    );
+    let tokens = quote!(pub #inner;);
+    let file = syn::parse2::<syn::File>(tokens).unwrap();
+    println!("{:#?}", file);
+
+    // Formerly parser crash.
+    let inner = Group::new(
+        Delimiter::None,
+        quote!(static FOO: usize; pub static BAR: usize),
+    );
+    let tokens = quote!(pub #inner;);
+    let file = syn::parse2::<syn::File>(tokens).unwrap();
+    println!("{:#?}", file);
+}
diff --git a/vendor/syn/tests/repo/mod.rs b/vendor/syn/tests/repo/mod.rs
index 4c7be853b..8418b8719 100644
--- a/vendor/syn/tests/repo/mod.rs
+++ b/vendor/syn/tests/repo/mod.rs
@@ -188,7 +188,7 @@ fn download_and_unpack() -> Result<()> {
         "https://github.com/rust-lang/rust/archive/{}.tar.gz",
         REVISION
     );
-    let response = reqwest::blocking::get(&url)?.error_for_status()?;
+    let response = reqwest::blocking::get(url)?.error_for_status()?;
     let progress = Progress::new(response);
     let decoder = GzDecoder::new(progress);
     let mut archive = Archive::new(decoder);
diff --git a/vendor/syn/tests/test_expr.rs b/vendor/syn/tests/test_expr.rs
index 8fd911e2a..e5b151fd8 100644
--- a/vendor/syn/tests/test_expr.rs
+++ b/vendor/syn/tests/test_expr.rs
@@ -53,36 +53,37 @@ fn test_await() {
 #[rustfmt::skip]
 #[test]
 fn test_tuple_multi_index() {
+    let expected = snapshot!("tuple.0.0" as Expr, @r###"
+    Expr::Field {
+        base: Expr::Field {
+            base: Expr::Path {
+                path: Path {
+                    segments: [
+                        PathSegment {
+                            ident: "tuple",
+                            arguments: None,
+                        },
+                    ],
+                },
+            },
+            member: Unnamed(Index {
+                index: 0,
+            }),
+        },
+        member: Unnamed(Index {
+            index: 0,
+        }),
+    }
+    "###);
+
     for &input in &[
-        "tuple.0.0",
         "tuple .0.0",
         "tuple. 0.0",
         "tuple.0 .0",
         "tuple.0. 0",
         "tuple . 0 . 0",
     ] {
-        snapshot!(input as Expr, @r###"
-        Expr::Field {
-            base: Expr::Field {
-                base: Expr::Path {
-                    path: Path {
-                        segments: [
-                            PathSegment {
-                                ident: "tuple",
-                                arguments: None,
-                            },
-                        ],
-                    },
-                },
-                member: Unnamed(Index {
-                    index: 0,
-                }),
-            },
-            member: Unnamed(Index {
-                index: 0,
-            }),
-        }
-        "###);
+        assert_eq!(expected, syn::parse_str(input).unwrap());
     }
 
     for tokens in vec![
@@ -93,28 +94,7 @@ fn test_tuple_multi_index() {
         quote!(tuple.0. 0),
         quote!(tuple . 0 . 0),
     ] {
-        snapshot!(tokens as Expr, @r###"
-        Expr::Field {
-            base: Expr::Field {
-                base: Expr::Path {
-                    path: Path {
-                        segments: [
-                            PathSegment {
-                                ident: "tuple",
-                                arguments: None,
-                            },
-                        ],
-                    },
-                },
-                member: Unnamed(Index {
-                    index: 0,
-                }),
-            },
-            member: Unnamed(Index {
-                index: 0,
-            }),
-        }
-        "###);
+        assert_eq!(expected, syn::parse2(tokens).unwrap());
     }
 }
 
diff --git a/vendor/syn/tests/test_iterators.rs b/vendor/syn/tests/test_iterators.rs
index 2c8359c15..0ab0fb914 100644
--- a/vendor/syn/tests/test_iterators.rs
+++ b/vendor/syn/tests/test_iterators.rs
@@ -47,3 +47,22 @@ fn iter() {
     assert_eq!(p.iter_mut().next_back(), Some(&mut 4));
     assert_eq!(p.into_iter().next_back(), Some(4));
 }
+
+#[test]
+fn may_dangle() {
+    let p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
+    for element in &p {
+        if *element == 2 {
+            drop(p);
+            break;
+        }
+    }
+
+    let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
+    for element in &mut p {
+        if *element == 2 {
+            drop(p);
+            break;
+        }
+    }
+}
diff --git a/vendor/syn/tests/test_round_trip.rs b/vendor/syn/tests/test_round_trip.rs
index c7e6e488f..9a5801d44 100644
--- a/vendor/syn/tests/test_round_trip.rs
+++ b/vendor/syn/tests/test_round_trip.rs
@@ -21,8 +21,8 @@ use rustc_ast::ast::{
     WhereClause,
 };
 use rustc_ast::mut_visit::{self, MutVisitor};
-use rustc_error_messages::{DiagnosticMessage, FluentArgs, LazyFallbackBundle};
-use rustc_errors::{Diagnostic, PResult};
+use rustc_error_messages::{DiagnosticMessage, LazyFallbackBundle};
+use rustc_errors::{translation, Diagnostic, PResult};
 use rustc_session::parse::ParseSess;
 use rustc_span::source_map::FilePathMapping;
 use rustc_span::FileName;
@@ -168,10 +168,10 @@ fn translate_message(diagnostic: &Diagnostic) -> String {
     }
 
     let message = &diagnostic.message[0].0;
-    let args = diagnostic.args().iter().cloned().collect::<FluentArgs>();
+    let args = translation::to_fluent_args(diagnostic.args());
 
     let (identifier, attr) = match message {
-        DiagnosticMessage::Str(msg) => return msg.clone(),
+        DiagnosticMessage::Str(msg) | DiagnosticMessage::Eager(msg) => return msg.clone(),
         DiagnosticMessage::FluentIdentifier(identifier, attr) => (identifier, attr),
     };
 
diff --git a/vendor/syn/tests/test_size.rs b/vendor/syn/tests/test_size.rs
index 02b0700f0..32c6edaed 100644
--- a/vendor/syn/tests/test_size.rs
+++ b/vendor/syn/tests/test_size.rs
@@ -5,7 +5,7 @@ use syn::{Expr, Item, Lit, Pat, Type};
 
 #[test]
 fn test_expr_size() {
-    assert_eq!(mem::size_of::<Expr>(), 264);
+    assert_eq!(mem::size_of::<Expr>(), 272);
 }
 
 #[test]
@@ -15,7 +15,7 @@ fn test_item_size() {
 
 #[test]
 fn test_type_size() {
-    assert_eq!(mem::size_of::<Type>(), 280);
+    assert_eq!(mem::size_of::<Type>(), 288);
 }
 
 #[test]