public static IEnumerable <INamedTypeSymbol> Types(this INamespaceOrTypeSymbol symbol, Type type)
{
var current = new INamespaceOrTypeSymbol[] { symbol };
foreach (var segment in type.Path())
{
current = current.SelectMany(child => child.GetMembers(segment)).OfType <INamespaceOrTypeSymbol>().ToArray();
}
return(current.OfType <INamedTypeSymbol>().Where(child => child.IsGenericType == type.IsConstructedGenericType));
}