Fix code_inferred under v1.8

[KDr2]

Fix #13

[codecov]

Codecov Report

Merging #14 (cfd8a9d) into master (ef30d9f) will decrease coverage by 0.35%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   99.62%   99.27%   -0.36%     
==========================================
  Files           1        1              
  Lines         266      275       +9     
==========================================
+ Hits          265      273       +8     
- Misses          1        2       +1     

Impacted Files	Coverage Δ
src/CodeInfoTools.jl	99.27% <66.66%> (-0.36%)	⬇️

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