updated interpreter error and replaced parseExpr with the appropriate allowed expression

[mkarten]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.74%. Comparing base (e4455f6) to head (ce67ecc).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
interpreter/expr.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #419      +/-   ##
==========================================
+ Coverage   87.72%   87.74%   +0.02%     
==========================================
  Files          38       38              
  Lines        5603     5613      +10     
==========================================
+ Hits         4915     4925      +10     
  Misses        557      557              
  Partials      131      131              

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[Sanegv]

The Unit Tests should be split in smaller parts, and have more explicit error messages, but I don't see a real issue with the code