Bump proc-macro2 from 0.4.30 to 1.0.9

[dependabot-preview[bot]]

Bumps proc-macro2 from 0.4.30 to 1.0.9.

Release notes

Sourced from proc-macro2's releases.

1.0.9

• Match the escaping behavior of libproc_macro when displaying non-ascii strings and characters

1.0.8

• Work around rust-lang/rust#58736 which caused panics in TokenStream::from_str

1.0.7

• Return meaningful spans from Group::span_open and Group::span_close when running with span-locations feature enabled outside of a procedural macro

1.0.6

• No code changes.

Just retriggering a docs.rs build because 1.0.5 failed. See alexcrichton/proc-macro2#203 and rust-lang/docs.rs#440.

1.0.5

• Improve performance of impl Extend<TokenTree> for TokenStream (#198)

1.0.4

• Add Literal::subspan method to match libproc_macro (#195)

1.0.3

• Treat dev builds of rustc the same as a nightly, with unstable features available

1.0.2

• Add impl From<TokenTree> for TokenStream to match libproc_macro

1.0.1

• Documentation improvements
• Fail with a better error message when being built on a compiler that is too old

1.0.0

• Minimum supported rustc version is raised from 1.15 to 1.31
• Deprecated TokenStream::empty constructor has been removed in favor of TokenStream::new

Commits

• b7daef7 Release 1.0.9
• ff2fc3c Merge pull request #215 from alexcrichton/escape
• 8da6698 Don't escape_default all non-ascii text
• 903a972 Release 1.0.8
• c24b933 Merge pull request #211 from dtolnay/parse
• 44bca66 Work around proc_macro::TokenStream::from_str panics
• d5d48ed Release 1.0.7
• 8ce7c67 Merge pull request #209 from dtolnay/groupspan
• bd07d02 Implement meaningful Group::span_open/close in fallback implementation
• 0ce0b32 Remove unimportant inline attributes
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #568.