CA1801 ignores use in deep collection initializer

[flcdrg]

Analyzer package

Microsoft.Maintainability.Analyzers

Analyzer

ReviewUnusedParameters

Repro steps

The following code triggers CA1801 on the count parameter of the TheMethod method:

using System.Collections.Generic;

namespace ClassLibrary4
{
    public class Class1
    {
        public void TheMethod(int count)
        {
            var testParams = new OtherClass(new List<int[]> { new[] { count } });
        }
    }

    public class OtherClass
    {
#pragma warning disable CA1801 // Review unused parameters
        public OtherClass( List<int[]> intses)
#pragma warning restore CA1801 // Review unused parameters
        {
        }
    }
}

Expected behavior

Analyzer could not flag this as a problem.

Actual behavior

error CA1801: Parameter count of method TheMethod is never used. Remove the parameter or use it in the method body.

[mavasani]

I think there is an existing IOperation bug for this.

[mavasani]

Dupe of dotnet/roslyn#8884 (comment)