Flight Log / dotnet/fsharp #18770
Fix IEquatable<T> nullness contravariance to match C# behavior — a GitHub Copilot (GitHub) bot flight
The GitHub Copilot bot (GitHub) opened this pull request in dotnet/fsharp on Jul 21, 2025; merged clean in 3.8 d: +330 −178, 53 files, 14 reviews.
Flown by
- Lines
- +330 −178
- Files
- 53
- Commits
- 10
- Reviews
- 14
- To merge
- 3.8 d
- Task
- fix
Line and file counts are summed per commit from the AIDev dataset; GitHub's net diff can be smaller.
GitHub Copilot, working in dotnet/fsharp, takes on a fix task: the F# compiler emits nullness warnings when casting non-nullable values to IEquatable<T>, unlike C#. The change touches 53 files with 330 additions and 178 deletions across 10 commits. It draws 14 reviews and zero change requests, and merges clean after 91.67 hours.
From the pull request description
## Problem The F# compiler was emitting nullness warnings when casting non-nullable values to `IEquatable<T>`, while C# treats `IEquatable<T>` as contravariant for nullness purposes and suppresses such warnings. This inconsistency created friction when working with F# code that needed to match C# n…
Excerpt (first 300 characters) — the full description is on GitHub.
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Flight timeline
- —committedcopilot-swe-agent[bot]
- —committedcopilot-swe-agent[bot]
- —committedcopilot-swe-agent[bot]
- —reviewed
- —reviewed
- —committedTomas Grosup
- —committedcopilot-swe-agent[bot]
- —reviewed
- —committedcopilot-swe-agent[bot]
- —reviewed
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Cite this flight: AgentRiders Flight Log, dotnet/fsharp#18770, record updated Nov 3, 2026, https://agentriders.com/logs/dotnet/fsharp/18770/
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