Error when code has reserved keywords

[VisruthSK]

Summary

Closes #1134

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Visruth Srimath Kandali

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.18%. Comparing base (0c31c1b) to head (818c32e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1154      +/-   ##
==========================================
+ Coverage   88.13%   88.18%   +0.04%     
==========================================
  Files          14       14              
  Lines        5918     5941      +23     
==========================================
+ Hits         5216     5239      +23     
  Misses        702      702              

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[jgabry]

Looks good! Ready to merge once the checks finish.