Fix REPL error source diagnostics

[terror]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.38813% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.80%. Comparing base (febf90f) to head (fbc90d6).

Files with missing lines	Patch %	Lines
src/arguments.rs	83.22%	26 Missing ⚠️
src/error.rs	72.72%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   79.71%   80.80%   +1.09%     
==========================================
  Files          28       29       +1     
  Lines        3879     4037     +158     
==========================================
+ Hits         3092     3262     +170     
+ Misses        787      775      -12     

Flag	Coverage Δ
unit	80.80% <85.38%> (+1.09%)	⬆️

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