(#390) - Simplify grammar, remove anonymous

[andreoss]

Per #390

[codecov]

Codecov Report

Merging #570 (9c0a03c) into master (b1e4f14) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #570      +/-   ##
============================================
- Coverage     80.83%   80.77%   -0.06%     
+ Complexity      477      475       -2     
============================================
  Files           133      133              
  Lines          2478     2471       -7     
  Branches        220      220              
============================================
- Hits           2003     1996       -7     
  Misses          404      404              
  Partials         71       71              

Impacted Files	Coverage Δ
...er/src/main/java/org/eolang/parser/XeListener.java	95.08% <ø> (-0.19%)	⬇️

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[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 9min)