add retractall/1

[ichiban]

#144

[codecov-commenter]

Codecov Report

Merging #155 (c3e4ce5) into main (101bd8e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   93.90%   93.90%           
=======================================
  Files          18       18           
  Lines        5281     5281           
=======================================
  Hits         4959     4959           
  Misses        272      272           
  Partials       50       50           

Impacted Files	Coverage Δ
engine/exception.go	98.11% <100.00%> (ø)
engine/vm.go	80.96% <100.00%> (ø)
interpreter.go	92.34% <100.00%> (ø)

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