Flight Log / microsoft/testfx #6162
Optimize TrimStackTrace to use spans instead of Regex.Split — a GitHub Copilot (GitHub) bot flight
The GitHub Copilot bot (GitHub) opened this pull request in microsoft/testfx on Jul 25, 2025; a burn — closed unmerged after human review: +175 −9, 3 files, 1 review.
Flown by
- Lines
- +175 −9
- Files
- 3
- Commits
- 4
- Reviews
- 1
- To merge
- —
- Task
- perf
Line and file counts are summed per commit from the AIDev dataset; GitHub's net diff can be smaller.
The agent was assigned a performance task in microsoft/testfx: replace Regex.Split in TrimStackTrace with a span-based approach. The change touched three files, with 175 additions and nine deletions across four commits. One human review asked: "Project is multi-targeted, please use span only for net6+". The PR closed unmerged after review, logged as a burn.
“Project is multi-targeted, please use span only for net6+”
— from the review (source)
From the pull request description
This PR optimizes the `TrimStackTrace` method in `ExceptionHelper.cs` by replacing the inefficient `Regex.Split` usage with a span-based approach that eliminates unnecessary allocations. ## Problem The current implementation uses `Regex.Split(stackTrace, Environment.NewLine)` which is overkill for…
Excerpt (first 300 characters) — the full description is on GitHub.
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Flight timeline
- —committedcopilot-swe-agent[bot]
- —committedcopilot-swe-agent[bot]
- —reviewed
- —committedcopilot-swe-agent[bot]
- —committedAmaury Levé
- Jul 25, 2025closedEvangelink
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Cite this flight: AgentRiders Flight Log, microsoft/testfx#6162, record updated Nov 3, 2026, https://agentriders.com/logs/microsoft/testfx/6162/
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