Fix TUnit0023 false positives for disposal through casts - #6818
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Included review availability: Your plan provides up to 8 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe analyzer now stops conversion unwrapping at boxing conversions. This preserves TUnit0023 diagnostics for boxed disposable struct members while retaining accepted results for valid reference and interface casts. Tests cover synchronous and asynchronous cleanup paths. ChangesDisposable cast detection
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~15 minutes Change: Bug fix · Severity of issue fixed: Low Merge Risk: ⚪ Minimal · up to The cast-resolution change preserves diagnostics for boxed struct copies while allowing valid reference casts. No unresolved merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Greptile SummaryThis PR corrects TUnit0023 disposal tracking when fields or properties are accessed through casts.
Confidence Score: 5/5The PR appears safe to merge with no outstanding correctness or security findings. The analyzer now unwraps only conversions that preserve object identity, directly recognizes disposal interface receiver types, and includes focused negative controls for conversions that must not count as member cleanup.
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| Filename | Overview |
|---|---|
| src/TUnit.Analyzers/DisposableFieldPropertyAnalyzer.cs | Resolves cast and conditional-access disposal receivers while excluding conversions that can dispose a copy or another object. |
| tests/TUnit.Analyzers.Tests/DisposableFieldPropertyAnalyzerTests.cs | Adds broad regression coverage for valid cast-based cleanup and negative boxing, unboxing, unrelated-receiver, and hook-level cases. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Dispose or DisposeAsync invocation] --> B{Conditional access receiver?}
B -->|Yes| C[Resolve conditional access operation]
B -->|No| D[Inspect receiver conversion]
C --> D
D --> E{Identity or reference conversion?}
E -->|Yes| F[Unwrap conversion operand]
F --> D
E -->|No| G{Field or property reference?}
G -->|Yes| H[Match member to cleanup scope]
G -->|No| I[Do not count as member disposal]
Reviews (2): Last reviewed commit: "fix: preserve disposal diagnostics for b..." | Re-trigger Greptile
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Inline comments:
In `@src/TUnit.Analyzers/DisposableFieldPropertyAnalyzer.cs`:
- Line 323: Update the conversion-unwrapping loop in the disposable
field/property analyzer to unwrap only identity and reference conversions,
excluding built-in boxing conversions even when OperatorMethod is null. Add a
regression test covering a disposable struct field cast to IDisposable that
expects a TUnit0023 diagnostic.
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src/TUnit.Analyzers/DisposableFieldPropertyAnalyzer.cstests/TUnit.Analyzers.Tests/DisposableFieldPropertyAnalyzerTests.cs
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Description
TUnit0023 incorrectly reports a disposable field or property when cleanup calls
Dispose()orDisposeAsync()through a cast, including the explicitIDisposableimplementation in #6804.Recognize the disposal interface itself as well as types implementing it, and unwrap identity and reference conversions after resolving conditional access. Boxing and unboxing remain excluded because they dispose a copy; user-defined conversions remain excluded because they can return a different object.
Add 70 regression cases covering the reported reproduction, synchronous and asynchronous disposal, fields and properties,
this, direct and conditional casts,as, nested casts, matching and mismatched cleanup levels, unrelated receivers, user-defined conversions, and boxing/unboxing of disposable structs.Related Issue
Fixes #6804
Type of Change
Checklist
Testing
DisposableFieldPropertyAnalyzerTestspassed on each of .NET 8, 9, and 10 (351 passed, 0 failed).git diff --checkpassed.Command:
dotnet test --project tests/TUnit.Analyzers.Tests/TUnit.Analyzers.Tests.csproj --treenode-filter "/*/*/DisposableFieldPropertyAnalyzerTests/*" --no-progress --output DetailedAdditional Notes
This change only affects analyzer behavior. It does not change source generator output, public APIs, runtime discovery, execution, or reflection paths.
Summary by CodeRabbit
Bug Fixes
Tests