Bump proc-macro2 from 1.0.24 to 1.0.39

[dependabot]

Bumps proc-macro2 from 1.0.24 to 1.0.39.

Release notes

Sourced from proc-macro2's releases.

1.0.39

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

1.0.38

• Reduce allocations done by Literal::byte_string constructor (#328)

1.0.37

• Rely on unicode-xid to optimize ASCII properly (#325)

1.0.36

• Improve performance of creating literal tokens through quote! macro

1.0.35

• Try to diagnose "cannot find type SourceFile" errors better (#311)

1.0.34

• Work around doc build failure due to docs.rs flags change (#310)

1.0.33

• Enable Group::span_open/span_close on Rust 1.55+ to reflect their stabilization in rustc (#305, rust-lang/rust#86136)

1.0.32

• Support negative int and float literals in FromStr (rust-lang/rust#87262, #301)

1.0.31

• Update Cargo metadata to new repository location

1.0.30

• Use proc_macro::is_available on Rust 1.57+ to support projects built with panic=abort or cg_clif (#300, thanks @​bjorn3)

1.0.29

• Pick up stable implementation of proc_macro's impl FromStr for Literal (#287)

1.0.28

• Recognized Cargo's new CARGO_ENCODED_RUSTFLAGS environment variable (#294, rust-lang/cargo#9601)

1.0.27

• impl FromStr for Literal (#286, rust-lang/rust#84717)

1.0.26

• Add impl LexError { pub fn span(&self) -> Span } (#283)

1.0.25

• Documentation improvements (#278, #279)

Commits

• 6e59fa0 Release 1.0.39
• aec2129 Replace unicode-xid with unicode-ident crate
• 8649302 Run miri in stricter miri-strict-provenance mode
• b501cdf Release 1.0.38
• 4445659 Merge pull request #328 from dtolnay/formatpushstring
• d307f56 Restore support for rust pre-1.33
• 16c4bb4 Eliminate an allocation from Literal::byte_string
• 4a3502c Merge pull request #327 from dtolnay/testliteral
• 8725ff4 Add more tests of Literal constructors
• 8e794fc Add a miri test job in CI
• Additional commits viewable in compare view

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[dependabot]

Superseded by #116.