fix: a gc bug causing slice get collected early than expected

[Chronostasys]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.06%. Comparing base (f14abbc) to head (5e85560).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #443      +/-   ##
==========================================
- Coverage   84.82%   84.06%   -0.76%     
==========================================
  Files         100      100              
  Lines       26570    26638      +68     
==========================================
- Hits        22538    22394     -144     
- Misses       4032     4244     +212     

Files with missing lines	Coverage Δ
src/ast/builder/llvmbuilder.rs	91.80% <100.00%> (+0.05%)	⬆️

... and 11 files with indirect coverage changes

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