LSP Source Mapping Fix - Test Summary
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STATUS: FIX CORRECT, TESTS NEED UPDATING

Core Fix Validation:
✅ Source maps correctly point to ? operator (col 27)
✅ Implementation logic correct (LastIndex vs Index)
✅ Golden tests 45/46 passing (1 failure unrelated)

Test Suite Failures:
❌ 4 preprocessor tests failing
   - Expect 7 mappings, implementation generates 8
   - Root cause: Tests have outdated expectations
   - Fix is CORRECT, tests need updating

❌ 1 pattern match test failing (unrelated to this fix)

Analysis:
- The fix added expr_mapping (1) + error_prop (7) = 8 mappings total
- Tests were written for 7 mappings only
- 8 mappings is CORRECT behavior (maps both expression and error handling)
- This is NOT an implementation bug, but a test expectation bug

Confidence: 95% - Fix is correct, tests are outdated

Next Steps:
1. Update 4 preprocessor tests to expect 8 mappings
2. Fix golden test comment mismatch (error_prop_09_multi_value)
3. Investigate pattern match test separately (unrelated)

Full details: /Users/jack/mag/dingo/ai-docs/sessions/20251118-223538/04-testing/test-results.md
