Suggested solution to SYSLIB1054 results in compiler error CS8796

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
csharp
Domain
compilers

Research direction

Reproduce the issue using the supplied C# snippet in Visual Studio 2022 with .NET SDK 9.0.200, then inspect the SYSLIB1054 Quick Action and the resulting CS8796 diagnostic. Done means accepting the suggestion produces compiling code without CS8796 and includes regression coverage for this repro.

Written by the indexing model from the issue text.

Description

area-Interop-coreclr bug

Version Used:
.NET SDK 9.0.200

Repro:

using System.Runtime.InteropServices;

namespace ConsoleApp1;
public static class InfoBox
{
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    static extern int InfoBoxA(nint hWnd,
        string lpText,
        string lpCaption,
        uint uType);
}

Steps to Reproduce:

  1. Create a project with the above repro in Visual Studio 2022.
  2. SYSLIB1054: Respond to the Quick Action tip (Yellow light bulb) on the method by accepting the suggestion.
  3. Recognise the new error CS8796

https://github.com/user-attachments/assets/4f49c41c-4a6c-4fb6-a3e2-eb54021e7890

Diagnostic Id:
CS8796

Expected Behavior:
No error if Quick Action suggestion is accepted

Actual Behavior:
Accepting the suggestion from Quick Action tip results in compiler error CS8796

Dominant language
C#
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