add acyclic_term/1

[ichiban]

#144

[codecov-commenter]

Codecov Report

Merging #152 (ec3344c) into main (7b8c487) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   93.81%   93.83%   +0.02%     
==========================================
  Files          18       18              
  Lines        5236     5257      +21     
==========================================
+ Hits         4912     4933      +21     
  Misses        274      274              
  Partials       50       50              

Impacted Files	Coverage Δ
engine/builtin.go	91.13% <100.00%> (+0.08%)	⬆️
interpreter.go	92.26% <100.00%> (+0.04%)	⬆️

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