Don't report assignment to ref extension parameter as unused #81680
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@CyrusNajmabadi @dotnet/roslyn-ide for review. Thanks |
| #else | ||
| if (owningSymbol.ContainingSymbol is INamedTypeSymbol { IsExtension: true, ExtensionParameter: { } extensionParameter }) | ||
| { | ||
| return parameters.Insert(0, extensionParameter); |
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this is fine with me. but i'm curious why this was placed in position 0. it's not obvious as to why. consider doc'ing.
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| var parameters = owningSymbol.GetParameters(); | ||
| #if ROSLYN_4_12_OR_LOWER | ||
| return parameters; | ||
| #else | ||
| if (owningSymbol.ContainingSymbol is INamedTypeSymbol { IsExtension: true, ExtensionParameter: { } extensionParameter }) | ||
| { | ||
| return parameters.Insert(0, extensionParameter); | ||
| } | ||
|
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| return parameters; | ||
| #endif |
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Suggested change
| var parameters = owningSymbol.GetParameters(); | |
| #if ROSLYN_4_12_OR_LOWER | |
| return parameters; | |
| #else | |
| if (owningSymbol.ContainingSymbol is INamedTypeSymbol { IsExtension: true, ExtensionParameter: { } extensionParameter }) | |
| { | |
| return parameters.Insert(0, extensionParameter); | |
| } | |
| return parameters; | |
| #endif | |
| var parameters = owningSymbol.GetParameters(); | |
| #if !ROSLYN_4_12_OR_LOWER | |
| if (owningSymbol.ContainingSymbol is INamedTypeSymbol { IsExtension: true, ExtensionParameter: { } extensionParameter }) | |
| { | |
| return parameters.Insert(0, extensionParameter); | |
| } | |
| #else | |
| return parameters; | |
| #endif |
CyrusNajmabadi
approved these changes
Dec 16, 2025
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This was referenced Dec 17, 2025
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DataFlowAnalyzer.SetAnalysisDataOnMethodExithas logic to recognize assignments toref/outparameters as reachable and used, The fix is to perform the analysis considering the full set of parameters, including the extension parameter.Fixes #81554