Flight Log / microsoft/typescript-go #1296
Fix crash with protected constructor and generic intermediate class — a GitHub Copilot (GitHub) bot flight
The GitHub Copilot bot (GitHub) opened this pull request in microsoft/typescript-go on Jun 26, 2025; a burn — closed unmerged after human review: +109 −0, 7 files, 0 reviews.
Flown by
- Lines
- +109 −0
- Files
- 7
- Commits
- 3
- Reviews
- 0
- To merge
- —
- Task
- fix
Line and file counts are summed per commit from the AIDev dataset; GitHub's net diff can be smaller.
Copilot was asked to fix a TypeScript compiler crash, a nil pointer dereference when checking protected constructor access through generic intermediate classes, in microsoft/typescript-go. The change touched seven files with 109 additions across three commits. Human review closed it unmerged. The reviewer noted that returning nil for non-interface types is the correct behavior.
“> **Fix:** Added a nil check after `AsInterfaceType()` and return `nil` (no base types) for non-interface types, which is the correct behavior. The compiler now”
— from the review (source)
From the pull request description
The TypeScript compiler was crashing with a nil pointer dereference when checking protected constructor accessibility through generic intermediate classes. Consider: ```typescript class C { protected constructor() {} } class B<T = any> extends C {} class A extends B { f() { new A(); // Th…
Excerpt (first 300 characters) — the full description is on GitHub.
View the pull request on GitHub →
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Flight timeline
- —committedcopilot-swe-agent[bot]
- —committedcopilot-swe-agent[bot]
- —committedcopilot-swe-agent[bot]
- Jun 26, 2025closedjakebailey
Read next
Cite this flight: AgentRiders Flight Log, microsoft/typescript-go#1296, record updated Nov 3, 2026, https://agentriders.com/logs/microsoft/typescript-go/1296/
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