Fix feature gates

[dr-orlovsky]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 160 lines in your changes are missing coverage. Please review.

Project coverage is 31.2%. Comparing base (61e8723) to head (d3444bc).

Files	Patch %	Lines
src/isa/exec.rs	0.0%	156 Missing ⚠️
src/library/lib.rs	0.0%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #107     +/-   ##
========================================
- Coverage    31.2%   31.2%   -0.0%     
========================================
  Files          23      23             
  Lines        6469    6472      +3     
========================================
  Hits         2020    2020             
- Misses       4449    4452      +3     

Flag	Coverage Δ
rust	31.2% <0.0%> (-<0.1%)	⬇️

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