Parse a body file expression

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 90.62500% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.3%. Comparing base (a54ae2a) to head (1c977e5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/syntax/parser/v2/parser.go	90.4%	1 Missing and 1 partial ⚠️
internal/syntax/ast/expression.go	88.8%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #88     +/-   ##
=======================================
+ Coverage   77.6%   78.3%   +0.6%     
=======================================
  Files         24      24             
  Lines       1774    1794     +20     
=======================================
+ Hits        1377    1405     +28     
+ Misses       317     308      -9     
- Partials      80      81      +1     

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