Bump proc-macro2 from 1.0.24 to 1.0.43

[dependabot]

Bumps proc-macro2 from 1.0.24 to 1.0.43.

Release notes

Sourced from proc-macro2's releases.

1.0.43

• Add keywords to crates.io metadata

1.0.42

• Improve parsing performance in non-macro mode (#335)
• Expose a size_hint() for TokenStream's iterator (#334)

1.0.41

• Produce an accurate .size_hint() from TokenStream's iterator (#334)

1.0.40

• Stabilize Ident::new_raw constructor (#331, thanks @​mystor)

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

... (truncated)

Commits

• 774a265 Release 1.0.43
• 95f5e5a Update keywords in crates.io metadata
• 971948a Change std imports to core where possible
• 40c2cef Add authors to Cargo.toml
• efac913 Unwrap description to one line in toml
• 793cf1c Sort package entries in Cargo.toml
• e9a734c Ignore assertions_on_result_states clippy lint
• a77588b Release 1.0.42
• a2b46f9 Remove allocation from RcVec -> RcVecBuilder conversion
• d8c056b Clean up RcVec::get_mut
• Additional commits viewable in compare view

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[dependabot]

Superseded by #129.