ilverify-failure
Fix ILVerify baseline failures when IL shape changes (codegen, new types, method signatures). Use when CI fails on ILVerify job.
Source facts
- Repository
- dotnet/fsharp
- Last source activity
- June 23, 2026 at 15:12
- Detected SKILL.md language
- English
- Stars
- 4,344
- Forks
- 881
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- ilverify-failure
- description
- Fix ILVerify baseline failures when IL shape changes (codegen, new types, method signatures). Use when CI fails on ILVerify job.
# ILVerify Baseline
## When to Use
IL shape changed (codegen, new types, method signatures) and ILVerify CI job fails.
## Offset-Only Differences
Changes that only shift IL byte offsets (`[offset 0x...]`) — for example adding code above an existing error site — are detected automatically and **do not fail CI**. A warning is printed suggesting a baseline update. No action is required, but refreshing baselines keeps them accurate.
## Update Baselines
```bash
TEST_UPDATE_BSL=1 pwsh tests/ILVerify/ilverify.ps1
```
Or use the `/run ilverify` PR comment command to update baselines via CI.
## Baselines Location
`tests/ILVerify/*.bsl`
## Verify
Re-run without `TEST_UPDATE_BSL=1`, should pass.
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