dotnet/roslyn

IDE0060 (Remove unused parameter) false positive for interpolated string handler argument

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#76,578 opened on Dec 29, 2024

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Area-IDEBugFeature - IDE0060help wanted

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Description

Version Used:

VS 17.13 Preview 1

Steps to Reproduce:

public static void M(bool x, [InterpolatedStringHandlerArgument(nameof(x))] ref MyInterpolatedStringHandler y)
{
    // Do something with message. Analyzer will complain that `x` parameter isn't used. But it's actually used as the value will be passed to `MyInterpolatedStringHandler`
}

Diagnostic Id: IDE0060 (Remove unused parameter)

Expected Behavior:

No diagnostic

Actual Behavior:

False positive diagnostic

Contributor guide

Research direction
Understand the logic of InterpolatedStringHandlerArgument attribute handling in the unused parameter analysis and modify the analyzer to recognize that the parameter is used via the handler argument.
Tech stack
csharp
Domain
developer experiencetooling
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#Roslyn
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65