Faulty rewrite setting variable from outer scope inside foreach loop without reading it

[sonix1977nl]

If you have a loop that sets a variable living outside the scope of the loop without reading the variable, it results in faulty rewritten code. I have produced a minimal sample that demonstrates the problem.

The file "Program.cs" contains this code:

using System;
using System.Linq;

namespace RoslynLinqRewriteError
{
    public static class Program
    {
        public static void Main()
        {
            var values = new int[] { 1, 2, 3 };
            var result = 0;
            foreach (var value in values.Where(x => (x % 2) == 0))
            {
                result = value;
            }
            Console.WriteLine(result);
        }
    }
}

Compile it with this command:

roslyn-linq-rewrite.exe /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.6.2\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.6.2\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.6.2\System.dll" /out:RoslynLinqRewriteError.exe /target:exe Program.cs

This will result in the following error:

Could not compile rewritten method. Consider applying a [Shaman.Runtime.NoLinqRewrite] attribute.

(18,9): error CS0103: The name 'result' does not exist in the current context

If you change result = value to result = result + value it compiles without problem because the variable is also read inside of the loop.