Bump proc-macro2 from 1.0.75 to 1.0.88

[dependabot]

Bumps proc-macro2 from 1.0.75 to 1.0.88.

Release notes

Sourced from proc-macro2's releases.

1.0.88

• Return accurate line and column from Span::start and Span::end inside proc macros on nightly (#472)

1.0.87

• Check valid punctuation character in Punct::new (#470)

1.0.86

• Documentation improvements

1.0.85

• Mark some tests as only for 64-bit targets (#463)

1.0.84

• Documentation improvements (#455, thanks @​CensoredUsername)

1.0.83

• Optimize the representation of Ident (#462)

1.0.82

• Resolve unexpected_cfgs warning (#456)

1.0.81

• Documentation improvements

1.0.80

• Add Literal::byte_character constructor (#449)
• Add Literal::c_string constructor #450)

1.0.79

• Clean up dead code

1.0.78

• Expose Span::byte_range (#442)

1.0.77

• Add a function to reset thread-local span data (#438, thanks @​buchgr)

1.0.76

• Work around dead_code warning false positive (#435)

Commits

• 6b3395a Release 1.0.88
• faee27e Merge pull request #472 from dtolnay/startend
• 44f8ff2 Restore nightly behavior of Span::start and Span::end
• 50b477d Release 1.0.87
• f0b6802 Merge pull request #471 from dtolnay/punctnew
• 98ea261 Check valid punctuation character in Punct::new
• d60aaad Ignore missing_panics_doc pedantic clippy lint
• 27061af Ignore needless_lifetimes clippy lint
• 9c1d3eb Upload CI Cargo.lock for reproducing failures
• aa9476b Release 1.0.86
• Additional commits viewable in compare view

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