Bump syn from 1.0.86 to 1.0.109

[dependabot]

Bumps syn from 1.0.86 to 1.0.109.

Release notes

Sourced from syn's releases.

1.0.108

• Fix handling of unusual whitespace after escaped newlines in LitStr::value (#1381, thanks @​ModProg)

1.0.107

• Opt out of -Zrustdoc-scrape-examples on docs.rs for now

1.0.106

• Documentation improvements

1.0.105

• Improve parse errors related to dyn and impl type syntax (#1245)

1.0.104

• Add PathArguments::is_none()

1.0.103

• Implement PartialOrd for Cursor (#1236, #1237, thanks @​CAD97)

1.0.102

• More efficient internal representation for TokenBuffer (#1223, thanks @​CAD97)
• Fix parsing of a left shift after macro metavariable in type position (#1229)

1.0.101

• Eliminate a bunch of redundant work done by LitStr::parse (#1221)

1.0.100

• Parse closures with explicit empty lifetime parameter list for<> || -> T {…} (#1212, rust-lang/rust#97362)
• Parse dyn* provisional syntax (#1213, rust-lang/rust#91611)
• Parse attributes on the "rest" pattern of a struct in pattern position, Struct { #[attr] .. } (#1214)
• Parse static async and static async move closures (#1215, rust-lang/rust#62290)

1.0.99

• Add categories and keywords to crates.io metadata

1.0.98

• Format example code with rustfmt

1.0.97

• Update examples

1.0.96

• Add a punct_mut() method on syn::punctuated::Pair to return Option<&mut P> (#1183)

1.0.95

• Replace unicode-xid with unicode-ident crate: https://github.com/dtolnay/unicode-ident

1.0.94

• Resolve some unused_macro_rules warnings

1.0.93

... (truncated)

Commits

• bfa790b Release 1.0.109
• c182545 Restore compatibility with rust 1.31
• 01f69e9 Release 1.0.108
• 62d0aed stricter parsing of string_continue escapes
• 4168f6b Release 1.0.107
• d8690f2 Opt out -Zrustdoc-scrape-examples on docs.rs
• 5306cde Release 1.0.106
• 6db337c Update build status badge
• 876a605 Merge pull request #1251 from dtolnay/instaloop
• 65e0e42 Fix invalid use of insta snapshot inside a loop
• Additional commits viewable in compare view

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