replace EachList by ListIterator

[ichiban]

No description provided.

[codecov-commenter]

Codecov Report

Merging #177 (e6babd8) into main (08fb802) will increase coverage by 0.46%.
The diff coverage is 95.79%.

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   95.48%   95.95%   +0.46%     
==========================================
  Files          19       20       +1     
  Lines        6052     6083      +31     
==========================================
+ Hits         5779     5837      +58     
+ Misses        228      205      -23     
+ Partials       45       41       -4     

Impacted Files	Coverage Δ
engine/builtin.go	93.61% <92.53%> (+0.76%)	⬆️
engine/clause.go	97.82% <100.00%> (ø)
engine/compound.go	100.00% <100.00%> (ø)
engine/dcg.go	95.89% <100.00%> (+0.02%)	⬆️
engine/exception.go	100.00% <100.00%> (+1.88%)	⬆️
engine/iterator.go	100.00% <100.00%> (ø)
engine/lexer.go	100.00% <100.00%> (ø)
engine/number.go	100.00% <100.00%> (ø)
engine/parser.go	95.34% <100.00%> (+0.63%)	⬆️
engine/vm.go	82.74% <100.00%> (ø)
... and 7 more

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