Bump proc-macro2 from 0.4.30 to 1.0.21

[dependabot-preview]

Bumps proc-macro2 from 0.4.30 to 1.0.21.

Release notes

Sourced from proc-macro2's releases.

1.0.21

• Match libproc_macro's UnwindSafe and RefUnwindSafe impls (#250)

1.0.20

• Match libproc_macro's rendering of whitespace in groups (#246, #247, thanks @Koxiaet)

1.0.19

• Remove procmacro2_semver_exempt feature gate on all methods stabilized in Rust 1.45 (#243)

1.0.18

• Fix discrepancy with libproc_macro in handling of negative numbers in token streams (#235)

1.0.17

• Allow using proc_macro2::fallback::force() from 1.0.12 at the same time as proc-macro2 = { default-features = false } (#233)

1.0.16

• impl Ord for proc_macro2::LineColumn (#230, rust-lang/rust#72446)

1.0.15

• Support parsing arbitrarily deeply nested token streams without using excessive stack space (#231, #232)

1.0.14

• Add Span::mixed_site(), which is behind cfg(procmacro2_semver_exempt) for now but will be stabilized when Rust 1.45 is released (#228, thanks @kevinmehall)
• Update LineColumn::column to match libproc_macro's column computation, which is character-based (#229, thanks @jrvidal)

1.0.13

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

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.

Commits

• 285269e Release 1.0.21
• c85cef2 Merge pull request #251 from alexcrichton/marker
• 23b7dd9 Remove unwind-safe test on rust 1.31.0
• 5ef63e0 Make proc macro types unwind safe
• 372f572 Add unwind safety to marker traits test
• cd87423 Consolidate marker trait handling into Marker type
• 24a41c9 Add ui test in subdirectory
• 3099596 Revert "Add ui test for the not-Send error message"
• 951423e Add ui test for the not-Send error message
• 170d959 Sort imports below mod
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #608.