Addressing #1200 and #1162 by additional priorities for the Sym non-terminal. The bootstrap and tests all run, but this change requires peer review and manual testing, for which I currently do not have the concentration.

[jurgenvinju]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47%. Comparing base (8634940) to head (325fd06).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #1201   +/-   ##
=======================================
  Coverage       47%     47%           
- Complexity    6705    6709    +4     
=======================================
  Files          791     791           
  Lines        65239   65247    +8     
  Branches      9769    9769           
=======================================
+ Hits         30910   30928   +18     
+ Misses       31910   31907    -3     
+ Partials      2419    2412    -7     

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