False report for RS0012 (Do not call ToImmutableDictionary on an ImmutableDictionary value)

[mavasani]

Analyzer package

Microsoft.NetCore.Analyzers 2.6.0-beta1

Analyzer

DoNotCallToImmutableCollectionOnAnImmutableCollectionValueAnalyzer

Repro steps

using System.Collections.Immutable;

public class C
{
    void M(ImmutableDictionary<int, int> a)
    {
        ImmutableDictionary<char, char> b = a.ToImmutableDictionary(kv => (char)kv.Key, kv => (char)kv.Value);
    }
}

Expected behavior

No RS0012 as we are producing a dictionary of different key/value types.

Actual behavior

Severity	Code	Description	Project	File	Line	Suppression State
Warning	RS0012	Do not call ToImmutableDictionary on an ImmutableDictionary value	ClassLibrary4	C:\Users\mavasani\source\repos\ClassLibrary3\ClassLibrary4\Class1.cs	7	Active