Hi All,
We have some code like so `` var hashSet = new HashSet<string>(); var hash = (IReadOnlyCollection<string>)hashSet; <pre><code> This complies correctly however fails at runtime with an error like so System.InvalidCastException : Unable to cast object of type 'System.Collections.Generic.HashSet1[System.String]' to type 'System.Collections.Generic.IReadOnlyCollection`1[System.String]'

MSDN says they added this in 4.5 https://msdn.microsoft.com/en-us/library/bb359438(v=vs.110).aspx

Wondering if we do not have the right implementation dlls in build machines. I have a sample project at https://github.com/harshgMSFT/Scratch

Please let me know if we are doing something incorrectly.