Add context when encountering invalid separator

[SRv6d]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #137 will not alter performance

_{Comparing context-error (37a765a) with main (c151f22)}

Summary

✅ 4 untouched benchmarks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.93%. Comparing base (c151f22) to head (37a765a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
+ Coverage   96.88%   96.93%   +0.04%     
==========================================
  Files           5        5              
  Lines         514      522       +8     
==========================================
+ Hits          498      506       +8     
  Misses         16       16              

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