Bump syn from 0.15.40 to 1.0.23

[dependabot-preview]

Bumps syn from 0.15.40 to 1.0.23.

Release notes

Sourced from syn's releases.

1.0.23

• Parse inner attributes in traits (#803)
• Parse const underscore in traits and impls (#804)
• Implement Extend for Error (#805)
• Parse Or patterns (#806)
• Parse outer attributes on Expr* structs (#807)
• Parse top level const/static without value (#808)
• Parse syntactically accepted functions (#809)
• Parse extern static with value (#810)

Thanks @taiki-e for all of these.

1.0.22

• Parse literal suffix on byte string, byte, and char literal tokens: br#"..."#suffix, b'?'suffix, '?'suffix (#799, #800)

1.0.21

• Documentation improvements

1.0.20

• Improve span of error message when an error during syn::Macro::parse_body is triggered past the last token of the macro body (#791)

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

... (truncated)

Commits

• 8b390da Release 1.0.23
• c487218 Merge pull request #809 from taiki-e/syntactically-accepted-fn
• 3e54be8 Parse syntactically accepted fn headers
• e694124 Parse extern fn with body
• 76c20d3 Parse top level fn without body
• 1a59c50 Merge pull request 810 from taiki-e/extern-static-with-value
• bbc62b4 Merge pull request #808 from taiki-e/const-static-no-body
• ecad443 Merge pull request #807 from taiki-e/expr-outer-attrs
• 33bf625 Merge pull request #811 from dtolnay/vert
• 594740b Add leading vert test
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #580.