Add short lambdas

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.77419% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.01%. Comparing base (ae269d6) to head (918ce8e).

Files with missing lines	Patch %	Lines
src/parser.rs	95.91%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   82.75%   83.01%   +0.26%     
==========================================
  Files          71       71              
  Lines        3496     3556      +60     
==========================================
+ Hits         2893     2952      +59     
- Misses        603      604       +1     

Flag	Coverage Δ
unit	83.01% <96.77%> (+0.26%)	⬆️

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