Bump proc-macro2 from 1.0.30 to 1.0.47

[dependabot]

Bumps proc-macro2 from 1.0.30 to 1.0.47.

Release notes

Sourced from proc-macro2's releases.

1.0.47

• Fix integer overflow when nesting depth of nested comments exceeds 4 billion (#357)

1.0.46

• Make proc_macro2::TokenStream's FromStr impl consistent with proc_macro::TokenStream's on strings that begin with a byte order mark \u{feff} (#353)

1.0.45

• Fix panic on parsing disallowed raw identifiers such as r#self (#351)

1.0.44

• Expose span.before() and span.after() to access an empty Span located immediately before or after the input span (#348, upstream tracking issue: rust-lang/rust#87552)

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

... (truncated)

Commits

• 47c91c8 Release 1.0.47
• c694208 Make i's inferred type explicit to be consistent with depth
• 46e9bd6 Merge pull request #358 from dtolnay/depth
• 5635f1b Fix integer overflow in nested comment parser
• 69150f4 Release 1.0.46
• 6004b0a Merge pull request #354 from dtolnay/bom
• 1d068c8 Test that byte order mark can only go at beginning of input
• e2327f0 Strip a byte order mark if present
• eeb2e5b Add a test involving byte order mark
• f26128d Release 1.0.45
• Additional commits viewable in compare view

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[dependabot]

Superseded by #151.