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  "state": "closed",
  "title": "Fix token cache parent mismatch panic in signature help",
  "number": 1338,
  "source": "aidev",
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  "debrief": "Copilot was asked to fix a token cache panic in signature help, triggered when refactoring wraps expressions in parentheses. The change touched 11 files with 270 additions and 236 deletions across eight commits. The pull request closed unmerged after human review, a burn. The reviewer wrote: \"This is all totally wrong. Revert everything you've done.\"",
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  "confidence": "dataset",
  "updated_at": "2026-11-03T21:49:05.92499+00:00",
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  "body_excerpt": "The signature help functionality was panicking with \"Token cache mismatch: parent. Expected parent of kind KindAsExpression, got KindCallExpression\" when the AST structure changed during refactoring operations like wrapping expressions with parentheses.\n\n## Problem\n\nThe issue occurred in the `GetOrC",
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  "reviewer_excerpt": "This is all totally wrong. Revert everything you've done. Your test should be put into `internal/ls/signaturehelp_test.go`. Verify that it fails before proceeding to fix the",
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  "reviewer_excerpt_url": "https://github.com/microsoft/typescript-go/pull/1338#issuecomment-3025410365"
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   "title": "Fix parameter-property with default value emitting `T | undefined` instead of `T`",
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   "title": "Fix comment formatting bug that mangled `*/` tokens",
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   "merged_at": "2025-07-22T16:46:34+00:00",
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