gistfile1.txt

Xamarin.Mac Project with

<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>

depends upon Roslyn:

    <Reference Include="Microsoft.CodeAnalysis">
      <HintPath>..\packages\Microsoft.CodeAnalysis.Common.2.1.0\lib\netstandard1.3\Microsoft.CodeAnalysis.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CodeAnalysis.CSharp">
      <HintPath>..\packages\Microsoft.CodeAnalysis.CSharp.2.1.0\lib\netstandard1.3\Microsoft.CodeAnalysis.CSharp.dll</HintPath>
    </Reference>

which pulls in facade nugets:

    <Reference Include="System.ValueTuple">
      <HintPath>..\packages\System.ValueTuple.4.3.0\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
    </Reference>


Since we are using a HintPath (like all nugets), msbuild resolve to the nuget facade:

      /Users/donblas/Downloads/TestRoslynApp/packages/System.ValueTuple.4.3.0/lib/netstandard1.0/System.ValueTuple.dll

instead of 

/Library/Frameworks/Xamarin.Mac.framework/Versions/Current/lib/mono/4.5/Facades/System.ValueTuple.dll

However during launch we refuse to load it:

2017-05-04 13:34:53.513 Test Roslyn App[12499:2869918] info: Denying load of problematic image /Users/brajkovic/Projects/TestRoslynApp/TestRoslynApp/bin/Debug/Test Roslyn App.app/Contents/MonoBundle/System.ValueTuple.dll