public static void AddExplicitInterfaceQualifierToId(Context cx, System.IO.TextWriter trapFile, IEnumerable <ISymbol> explicitInterfaceImplementations)
{
if (explicitInterfaceImplementations.Any())
{
trapFile.AppendList(",", explicitInterfaceImplementations.Select(impl => cx.CreateEntity(impl.ContainingType)));
}
}