parser: prevent self-reference within templates

[abiosoft]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.20%. Comparing base (57634a6) to head (3765ef9).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   91.11%   91.20%   +0.08%     
==========================================
  Files           3        3              
  Lines         304      307       +3     
==========================================
+ Hits          277      280       +3     
  Misses         17       17              
  Partials       10       10              

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