[LucaCappelletti94]

String introducers for single-quoted, double-quoted, and hexadecimal literals are handled by the first matching arm. The repeated arm can never run.

Addresses the string-introducer duplication tracked in #2698.

Another echoes find.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.23%. Comparing base (72ce6a8) to head (93122d1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2716      +/-   ##
==========================================
+ Coverage   82.22%   82.23%   +0.01%     
==========================================
  Files          42       42              
  Lines       35343    35340       -3     
  Branches    35343    35340       -3     
==========================================
+ Hits        29060    29063       +3     
+ Misses       2716     2711       -5     
+ Partials     3567     3566       -1     

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