[esrrhs]

Summary

• Bring core line coverage from 94.6% → 95.8% (12234/12770), with c_gen.cpp included (95.14% on that file alone).
• Prior baseline on this effort: 92.6% (pre WIP) / 94.6% (tip before this commit).
• Prefer tests over production changes: expose SemanticAnalysis::CollectReturnsForBlock for direct coverage of the return-walk helper; add focused GTest + Lua cases for interp runtime/vm_ops edges, VarToVi/ViToVar bridges, TCC libraries config path, and file-level literals / empty body / dynamic for-step errors.

Reproduce (local, USE_COV=ON)

# from repo root, after building build-cov with USE_COV=ON
find build-cov -name '*.gcda' -delete
python3 tools/run_tests.py --build-dir build-cov -j $(nproc) --filter='-*redis*:*mysql.integration*'
lcov --capture --directory build-cov/src --directory build-cov/test --directory build-cov/cmd \
  --ignore-errors inconsistent,mismatch,corrupt,gcov,source,count -o coverage.info
lcov --extract coverage.info \
  '*/src/compile/*' '*/src/jit/*' '*/src/interp/*' '*/src/state/*' '*/src/var/*' '*/src/util/*' \
  --ignore-errors inconsistent,mismatch,unused -o coverage_core.info
lcov --summary coverage_core.info --ignore-errors inconsistent,mismatch

Tip: e50b569 on test/core-coverage-95. Do not merge until reviewed.

Test plan

• unit_tests --gtest_filter='core_cov_gaps.*' (18/18 pass)
• Parallel filtered suite (one unrelated flaky/pre-existing common.c_runtime_cov_matches_kCRuntimeHeader failure on one shard; re-run alone passes)
• Core summary ≥95% with c_gen.cpp present in coverage_core.info

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.75%. Comparing base (6331a7c) to head (149f1a9).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   88.49%   89.75%   +1.25%     
==========================================
  Files         125      125              
  Lines       27211    27231      +20     
==========================================
+ Hits        24081    24441     +360     
+ Misses       3130     2790     -340     

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