PCL breaks in roslyn

pclbreakage.cs

using AutoMapper;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using System;
using System.IO;
using System.Text;

namespace PclBreakage
{
    class Program
    {
        static void Main()
        {
            var references = new[]
            {
                new MetadataFileReference(typeof (object).Assembly.Location),
                new MetadataFileReference(typeof(Mapper).Assembly.Location)
            };

            var options = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary);

            var sb = new StringBuilder();
            sb.Append("using AutoMapper;");
            sb.Append("public class MyClass {");
            sb.Append("public MyClass() {");
            sb.Append("Mapper.CreateMap<MyClass, MyClass>();");
            sb.Append("}");
            sb.Append("}");

            var compilation = CSharpCompilation.Create("compiled.dll", new[] { SyntaxFactory.ParseSyntaxTree(sb.ToString()) }, references, options);

            byte[] result;
            using (var stream = new MemoryStream())
            {
                var emitResult = compilation.Emit(stream);
                if (emitResult.Success)
                {
                    result = stream.ToArray();
                }
                else
                {
                    throw new Exception("compile failed");
                }
            }
        }
    }
}