Bump proc-macro2 from 1.0.40 to 1.0.42

[dependabot[bot]]

Bumps proc-macro2 from 1.0.40 to 1.0.42.

Release notes

Sourced from proc-macro2's releases.

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)

Commits

• a77588b Release 1.0.42
• a2b46f9 Remove allocation from RcVec -> RcVecBuilder conversion
• d8c056b Clean up RcVec::get_mut
• 0fbcf3b Eliminate redundant RcVec::new
• 20eb5ed Merge pull request #341 from dtolnay/rcvec
• 275aaeb Replace Rc<Vec> with RcVec<T>
• e338234 Merge pull request #342 from dtolnay/debug
• 9d91c49 Improve Debug representation of token_stream::IntoIter
• ee0e583 Merge pull request #340 from dtolnay/extend
• c5db3d6 Reduce make_mut calls in FromIterator and Extend impls
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

Merging #80 (b9a26eb) into master (12fd212) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #80   +/-   ##
=======================================
  Coverage   51.45%   51.45%           
=======================================
  Files          13       13           
  Lines         826      826           
=======================================
  Hits          425      425           
  Misses        401      401           

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[dependabot[bot]]

Superseded by #85.