Bump syn from 1.0.70 to 1.0.80 in /src/rust

[dependabot]

Bumps syn from 1.0.70 to 1.0.80.

Release notes

Sourced from syn's releases.

1.0.80

• Parse unstable ~const syntax in where-clauses (#1083, tracking issue rust-lang/rust#67792)

1.0.79

• Support trailing + in dyn Trait syntax, including bare (non-dyn) pre-2018 trait object syntax (#1075, #1077, #1078, #1079, #1080, #1081)

1.0.78

• Parse trailing + in the bounds of impl Trait type (#1073)

1.0.77

• Match Rust 1.57+'s parsing of dot and question mark after a curly braced macro invocation (#1068)

1.0.76

• Parse unstable let–else syntax (#1050, #1057)
• Parse qualified braced variant expressions and patterns: <E>::V {..} (#1058, #1059)
• Fix precedence of outer attributes in front of an assignment expression in statement position (#1060)

1.0.75

• Improve spans on a method without body inside an impl block
• Documentation improvements (#922, thanks @​Tamschi)

1.0.74

• Reject for<'a> dyn Trait<'a> syntax; the correct representation is dyn for<'a> Trait<'a> (#1042)

1.0.73

• Add From<Ident>, From<Index>, From<usize> for Member (#1038, thanks @​m-ou-se)

1.0.72

• Parse const generics which use value of a previous const generic parameter as a default value (#1027)

1.0.71

• Fix panic deserializing an ItemImpl with a non-path in trait position (#1023)
• Parse visibility on impl blocks (#1024)
• Fix parsing a type parameter default on the first generic parameter of an impl block (#1025, thanks @​taiki-e)

Commits

• 3255bbf Release 1.0.80
• 92173e4 Merge pull request #1083 from dtolnay/tildeconst
• f2dbe27 Parse ~const in where-clause
• a7ad301 Merge pull request #1082 from dtolnay/punctuated
• d191825 d->p variable naming in Punctuated implementation
• 7d97618 Release 1.0.79
• 0beb488 Share some logic between impl Trait and dyn Trait parser
• cfff4f5 Remove link to a concluded impl Trait discussion
• eefccf6 Reject impl Trait containing only lifetimes
• 0f99404 Tweak TraitObject parser to work like ImplTrait parser
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[dependabot]

Looks like syn is up-to-date now, so this is no longer needed.