[WIP] Various identified issues#65
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koenbeuk
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May 10, 2026
koenbeuk
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- Prevent null reference exceptions during runtime.
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Pull request overview
This PR aims to prevent runtime null-reference failures by hardening generated polyfill interceptors (notably around params IExpressionTreeTransformer[] transformers) and adds targeted regression tests to cover previously identified edge cases.
Changes:
- Add null-argument and null-element validation for
transformersin generatedExpressionPolyfill.Create(..., params IExpressionTreeTransformer[] transformers)interceptors. - Add/extend unit, generator, and integration tests for expansion/polymorphism, polyfill edge cases (switch patterns, list patterns), and generator diagnostics behavior.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| tests/ExpressiveSharp.Tests/Extensions/ExpressionPolyfillTests.cs | Adds a regression test ensuring null transformer arguments throw ArgumentNullException. |
| tests/ExpressiveSharp.IntegrationTests/Tests/ExpansionEdgeCasesTests.cs | Adds integration coverage for polymorphic dispatch and additional polyfill edge cases. |
| tests/ExpressiveSharp.Generator.Tests/PolyfillInterceptorGenerator/JoinTests.cs | Adds a generator test that compiles the generated interceptor for GroupJoin with an anonymous result selector. |
| tests/ExpressiveSharp.Generator.Tests/ExpressiveGenerator/ListPatternTests.cs | Adds a diagnostic-regression test for list patterns on arrays. |
| tests/ExpressiveSharp.Generator.Tests/ExpressiveGenerator/IndexRangeTests.cs | Adds a diagnostic-regression test for string range slicing. |
| src/ExpressiveSharp.Generator/PolyfillInterceptorGenerator.cs | Emits null checks for transformers and its elements to avoid runtime NREs during transformer application. |
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| var errors = outputCompilation.GetDiagnostics() | ||
| .Where(d => d.Severity == DiagnosticSeverity.Error) | ||
| .ToList(); | ||
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| var result = RunExpressiveGenerator(compilation); | ||
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| var result = RunExpressiveGenerator(compilation); | ||
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