Fix closure environment leaks

[terror]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.93909% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.52%. Comparing base (febf90f) to head (4841d20).

Files with missing lines	Patch %	Lines
src/evaluator.rs	92.98%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage   79.71%   80.52%   +0.80%     
==========================================
  Files          28       29       +1     
  Lines        3879     4076     +197     
==========================================
+ Hits         3092     3282     +190     
- Misses        787      794       +7     

Flag	Coverage Δ
unit	80.52% <95.93%> (+0.80%)	⬆️

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