raise errors if it not part of the language

[saidctb]

Summary

Test plan

• PYTHONPATH=. pytest -q

Merge checklist

• All required checks are green (tests + parser-reference-guard).
• If parser Fortran data or goldens changed, the PR explains why.
• If using ignore-parser-reference-guard, the PR explains why it is safe.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
py312	94.56% <100.00%> (-0.19%)	⬇️

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Files with missing lines	Coverage Δ
c_parser/parser.py	90.45% <100.00%> (-0.39%)	⬇️

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