Bump proc-macro2 from 0.4.30 to 1.0.12

[dependabot-preview[bot]]

Bumps proc-macro2 from 0.4.30 to 1.0.12.

Release notes

Sourced from proc-macro2's releases.

1.0.12

• Add a way to force avoid using the compiler's libproc_macro implementation even when available (#220)

1.0.11

(yanked)

1.0.10

• Enable span-locations feature when building for play.rust-lang.org

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

• 7526e00 Release 1.0.12
• eed9356 Fix cfg of detection module
• 4014c74 Release 1.0.11
• 20fdacd Merge pull request #220 from alexcrichton/force
• b128cd6 Add a way to force fallback implementation
• 3bb54e8 Organize imports
• befadb7 Give WORKS initialization its own function
• fad56f7 Move proc-macro detection to a module
• b8e8a63 Rename nightly_works
• c434b64 Change nonpublic items from pub to pub(crate)
• Additional commits viewable in compare view

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