Use public JuliaSyntax node API

[codecov[bot]]

Codecov Report

Merging #11 (11ef2b9) into main (2a465cb) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   74.35%   74.35%           
=======================================
  Files           8        8           
  Lines         776      776           
=======================================
  Hits          577      577           
  Misses        199      199           

Flag	Coverage Δ
unittests	74.35% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/semantic_pass_tests.jl	91.82% <100.00%> (ø)

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