Bump syn from 0.15.40 to 1.0.19

[dependabot-preview]

Bumps syn from 0.15.40 to 1.0.19.

Release notes

Sourced from syn's releases.

1.0.19

• Parse a more lenient extern type syntax inside extern blocks (#763)

1.0.18

• Ignore unparsed empty None-delimited groups at the end of a macro input (#783)

1.0.17

• Expose syn::Lit in default-features = false mode

1.0.16

• Fix parsing of &raw raw reference operator (rust-lang/rust#64490) to require explicitly specified constness, &raw mut or &raw const

1.0.15

• Add Punctuated::first_mut to return a mut reference to the first sequence element

1.0.14

• Produce more helpful error messages from Attribute::parse_args

1.0.13

• Allow parse_quote! to parse Vec<Stmt>, with the same behavior as Block::parse_within (#741)

1.0.12

• Reject function signatures with an incorrectly placed receiver parameter, like fn f(x: u8, &self)
• Produce correctly spanned error when parsing punct beyond the end of a delimited group (#739)

1.0.11

• Implement quote::IdentFragment for syn::Member and syn::Index so that spans are preserved when using these types in quote's format_ident! macro

  use quote::format_ident;
  use syn::Index;
  let index: Index = /* ... */;
  let ident = format_ident!("__{}", index); // produces __0, __1, etc

1.0.10

• Provide Hash and Eq impls for syn::Member even without "extra-traits" feature enabled, as this type is commonly useful in a hashset

1.0.9

• Fix failure to parse tuple struct fields of tuple type starting with crate (#720, #723, thanks @mystor)
• Fix unexpected tokens being ignored when using Speculative::advance_to (#721, #723, thanks @mystor)

1.0.8

• Require trailing comma when parsing TypeTuple with one element (#716, thanks @8BitMate)

1.0.7

• Add a receiver getter to syn::Signature (#714, thanks @mystor)

... (truncated)

Commits

• e51bb8b Release 1.0.19
• 8e016b4 Merge pull request #790 from dtolnay/ety
• e98f372 Parse ForeignItem type with generics and bounds
• f104279 Remove travis bug workaround
• d290269 Update build status badge to GitHub Actions
• 562ce7b Remove Travis configuration
• 3e1ba83 Abbreviate clippy toolchain installation
• 6b535a8 Remove AppVeyor CI
• 0bc5df7 Tweak os declaration in ci.yml
• 8f3888c Add Windows build in GitHub Actions
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #573.