IDE0032 code fixer produces invalid code for static field assigned in constructor

[rampaa]

Version Used:
Visual Studio 2026 v18.0.0
.NET 10

Steps to Reproduce:

1. Use the following minimal code sample:

   public sealed class Test
   {
       private static Test? s_instance;
       public static Test Instance => s_instance!;
   
       public Test()
       {
           s_instance = this;
       }
   }

2. Observe that the analyzer reports IDE0032 for s_instance.

3. Apply the code fix suggested by the IDE.

4. Observe that the produced code cannot be compiled.

Diagnostic Id:
IDE0032: Use auto-implemented property

Expected Behavior:
The code fixer should not create invalid code that will not compile.

Actual Behavior:

The code fixer rewrites the class to:

public sealed class Test
{
    public static Test Instance => field!;

    public Test()
    {
        Instance = this;
    }
}

This results in the following compiler error:

CS0200: Property or indexer 'Test.Instance' cannot be assigned to — it is read only